Which of the following is a proportion?

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Multiple Choice

Which of the following is a proportion?

Explanation:
A proportion is an equation that states two ratios are equal. The key idea is that both sides are comparing quantities in the same way, so the two fractions represent the same value. For example, a/b = c/d is a proportion because the two ratios are equal. This lets you use cross-multiplication (a·d = b·c) to find missing values. This differs from just a single ratio, which is only one comparison of two quantities, or from an equation where the two ratios aren’t required to be equal. It’s also not about adding fractions. So the option that describes two ratios being equal captures the essence of a proportion.

A proportion is an equation that states two ratios are equal. The key idea is that both sides are comparing quantities in the same way, so the two fractions represent the same value. For example, a/b = c/d is a proportion because the two ratios are equal. This lets you use cross-multiplication (a·d = b·c) to find missing values.

This differs from just a single ratio, which is only one comparison of two quantities, or from an equation where the two ratios aren’t required to be equal. It’s also not about adding fractions. So the option that describes two ratios being equal captures the essence of a proportion.

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