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
In this proportion, the numerator 2 of the left side is proportional to the numerator 4 of the right side, and the denominator 5 of the left side is proportional to the denominator 10 of the right side. Thus, the proportion holds true.
Describe what makes a proportion. Give an example of a proportion.
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