Word Origin & History
late 14c., "due relation of one part to another," also "size or extent," from O.Fr. proportion (13c.), from L. proportionem (nom. proportio) "comparative relation, analogy," from phrase pro portione "according to the relation" (of parts to each other), from pro "for" + abl. of *partio "division," related
to pars (see part
). The verb "to adjust or regulate the proportions of" is attested from late 14c. Phrase out of proportion first attested 1710.
"My fortunes [are] as ill proportioned as your legs." [John Marston, "Antonio and Mellida," 1602]