In proportion is a term used to describe a relationship between two or more things that are equal in size, amount, or degree. PROPORTIONATE (13 letters) is an adjective used to describe something that is in proportion or has been adjusted so that it is in proportion. BALANCED (8 letters) is an adjective used to describe something that is even or equal on both sides. Prorata (7 letters) is an adverb used to describe something that is divided in proportion to a particular factor.