What is Proportion ?
Proportion is (noun) 1. a part of a whole Only a small proportion of his income comes from his TV appearances. 2. a relationship between the amount of something and the amount of something else Mix equal proportions of oil and vinegar. What is the proportion of men to women on the committee? 3. in proportion to showing how something is related to something else Our sales in Europe are tiny in proportion to those in the USA. The payment is very high in proportion to the time worked. out of proportion to not in a proper relationship His salary is totally out of proportion to the work he does.
source: Easier English, Student Dictionary Upper Intermediate Level