...proportion may be written in three different forms ; as, - = -; a:b = c:dy a:b::c:d. Each form is read, " the ratio of a to b is equal to the ratio of c to d ; " or, more briefly, " a is to b as c is to d." 319 The terms of a proportion are the four quantities...

...formed by two equal ratios a : b and c : d may be written in three ways : (1) a : b = c : d (read, the ratio of a to b is equal to the ratio of c to d). (2) a : b : : c : d (read, a is to b as c is to d). tv\ a - c (3) -b~d a and d are the extremes,...

...376. If the ratios ct : b and с : d form a proportion, the proportion is written a : b = с : d (read the ratio of a to b is equal to the ratio of с to d), or a:b::c:d (read a is to b in the same ratio as с is to d). The four numbers a, b, c, d...

...POLYGONS DEFINITIONS 210. A Proportion is a statement that two ratios are equal. 211. The statement that the ratio of a to b is equal to the ratio of c to d is written a_£ b~d 212. In the proportion - = -, we call a the first term, b the 0 Ct second term,...

...is '8 ; find a. 22. The ratio of 3 sq. ft. to x sq. inches is 1 '2 ; find x. 283. Proportion. — If the ratio of A to B is equal to the ratio of C to D, the four quantities A, B, C, D are called proportionals or are said to be in proportion. The statement...

...POLYGONS DEFINITIONS 210. A Proportion is a statement that two ratios are equal. 211. The statement that the ratio of a to b is equal to the ratio of c to d is written a_£ b~d 212. In the proportion - = -, we call a the first term, b the 0 Cd second term,...

...formed by two equal ratios a : b and с ; d may Ъе written in three ways : (1) a : b = с : d (read, the ratio of a to b is equal to the ratio of о to d). (2) a : b : : с : d (read, a is to b as с is to d), a and d are the extremes, b and с...

...lines that form the sign of equality. The proportion a : b = с : d, or a : b : : с : d, is read, ' the ratio of a to b is equal to the ratio of с to d,' or 'a is to b as с is to d.' 473. In a proportion, the first and fourth terms are called...

...equation whose members are ratios. Thus, о : 6 = с : d, or - = li a is a proportion, which is read, the ratio of a to b is equal to the ratio of с to d. The same proportion is sometimes written a:b::c:>l, which is read, a is to 6 as с is to d....

...to the ratio of the third to the fourth. A proportion may be written in either of two ways; thus if the ratio of a to b is equal to the ratio of c to d, the equality may be indicated by either of the following expressions: ld — = — , or a : b :...