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When two quantities always have the same relative size.

Having the same ratio.

The lengths of these two shapes are proportional (one shape's length is always twice as large as the other)

Another example: if weight is proportional to age, then a weight of 3kg on the 1st day means it will weigh 6kg on the 2nd day, 9kg on the 3rd day, 30kg on the 10th day, etc.

See: Ratio

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