PROPORTION, or Rule of Three. See ARITHMETIC.
Reciprocal PROPORTION. See RECIPROCAL. PROPORTION is also used for the relation between unequal things of the same kind, whereby their several parts correspond to each other with an equal augmentation or diminution.
Thus, in reducing a figure into little, or in enlarging it, care is taken to observe an equal diminution or enlargement, through all its parts: so that if one line, e. gr. be contracted by one-third of its length, all the rest shall be contracted in the same proportion.