Which concept is an equation stating that two ratios are equal, used to solve for a missing value?

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Multiple Choice

Which concept is an equation stating that two ratios are equal, used to solve for a missing value?

Explanation:
A proportion is an equation that states two ratios are equal and it lets you solve for a missing value by cross-multiplying. For example, if 2/5 = x/10, you cross-multiply: 2 × 10 = 5 × x, which gives 20 = 5x, so x = 4. This works because setting the two ratios equal means the same relationship holds on both sides, and multiplying across preserves that equality. Proportions are handy in scale problems, recipes, unit rates, and any time you need to find an unknown quantity based on a known ratio.

A proportion is an equation that states two ratios are equal and it lets you solve for a missing value by cross-multiplying.

For example, if 2/5 = x/10, you cross-multiply: 2 × 10 = 5 × x, which gives 20 = 5x, so x = 4. This works because setting the two ratios equal means the same relationship holds on both sides, and multiplying across preserves that equality.

Proportions are handy in scale problems, recipes, unit rates, and any time you need to find an unknown quantity based on a known ratio.

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