A proportion is a statement that two ratios are equal. The ratios can be written as fractions, decimals, or percentages. For example, if 3 out of 5 students in a class are girls, and 6 out of 10 students are girls, then this can be written as a proportion: 3/5 = 6/10.

rewrite this

The proportion can also be rewritten as 5/3 = 10/6, which is the reciprocal of the original proportion.