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Here is the problem: If 3 apples cost 1.50, how much do 7 apples cost?

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Proportion: 3 apples cost 1.50; find the cost of 7.

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Read the problem. 3 apples for 1.50.

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Unit price. 1.50 divided by 3 equals 0.50 per apple.

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Scale to the new quantity. 7 times 0.50 equals 3.50.

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So the answer is 7 apples cost 3.50.

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Find the price of one unit, then multiply by the quantity you need.

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3.50 divided by 7 equals 0.50 per apple, the same unit price, which checks out.