A proportion is a statement that two ratios or fractions are equal to each other. For a proportion to be true, the numerator (top number) of one ratio must be proportional to the numerator of the other ratio, and the denominator (bottom number) of one ratio must be proportional to the denominator of the other ratio.

For example, the following is a proportion:

2/5 = 4/10
make it a diffrent poportion