PROPORTION, the identity or similitude of two
ratios. Hence quantities that have the same ratio the one Proportion to the other are said to be proportional. Thus, if A be to B as C to D, or 8 be to 4 as 30 to 15, A, B, C, D, and 8, 4, 30, and 15, are said to be in proportion, or are simply called proportionals.