 | William Frothingham Bradbury - 1868 - 264 pàgines
...ie — j- •; = -, or 6 : a. ao aba 195. PROPORTION is an equality of ratios. Four quantities are proportional when the ratio of the first to the second is equal to the ratio of the third to the fourth. The equality of two ratios is indicated by the sign of equality (=) or by four... | |
 | Richard Wormell - 1868 - 286 pàgines
...trouble ourselves to inquire what this unit is. Four lines are in proportion, or are proportionals, when the ratio of the first to the second is equal to the ratio of the third and fourth. Very simple geometrical constructions enable us, as we shall see, to draw four straight... | |
 | James Hamblin Smith - 1869 - 412 pàgines
...the other product must form the means. 328. Three quantities are said to be in CONTINUED PROPORTION when the ratio of the first to the second is equal to the ratio of the second to the third. Thus a, b, с are in continued proportion if a : b = b : c. . The quantity b is called a MEAN PKOPOBTIONAL... | |
 | James Hamblin Smith - 1870 - 478 pàgines
...the other product must form the means. 358. Three .quantities are said to be in CONTINUED PBOPOKTION when the ratio of the first to the second is equal to the ratio of the second to the third. Thus a, 6, c are in continued proportion if a : b=b :c. Four quantities are said to be in Continued... | |
 | Richard Wormell - 1870 - 304 pàgines
...trouble ourselves to inquire what this unit is. Four lines are in proportion, or are proportionals, when the ratio of the first to the second is equal to the ratio of the third and fourth. Very simple geometrical constructions enable us, as we shall see, to draw four straight... | |
 | Elias Loomis - 1871 - 302 pàgines
...consequent ; if equal, equal ; and if less, less. Def. 3. Three quantities are said to be proportional, whey the ratio of the first to the second is equal to the ratio of th<i second to the third ; thus, if A, B, and C are in proportion then A : B : : B : C. In this case... | |
 | William Frothingham Bradbury - 1872 - 124 pàgines
...-}- T = -, or o : a. aba 4, Proportion is an equality of ratios. Four quantities are in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth. The equality of two ratios is indicated by the sign of equality (=), or by four... | |
 | William Frothingham Bradbury - 1872 - 262 pàgines
...bab 115, --*-T=jOro:«. aba 1, Proportion is an equality of ratios. Four quantities arc in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth. 2 The equality of two ratios is indicated by the sign of equality (=), or by four... | |
 | Charles W. Merrifield - 1872 - 332 pàgines
...chiefly useful is the equality of ratios, and this it is which is commonly called PROPORTION. Four quantities are said to be proportional when the ratio of the first to the second is the same as that of the third to the fourth. Simple cases of this are easily stated. For instance,... | |
 | Daniel W. Fish - 1874 - 298 pàgines
...antecedents, 4 and 5 are the consequents ; 8 and 5 are the extremes, 4 and 10 are the means. Three numbers are proportional, when the ratio of the first to the second...is equal to the ratio of the second to the third. Thus the numbers 4, 10, and 25 are proportional, since 4 : 10 = 10 : 25, the ratio of each couplet... | |
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Proportional, when the ratio of the first to the second is equal to the ratio of the second to the third. 
