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You can set up a proportion and solve for the unknown side. Say that your rectangle has a short side that measures 4. The long side, unknown at this time, is x. The scale factor of the long side to the short side is 2/1 or 2:1. That would mean that the ratio of the actual side measurements, long side to short side, would be x/4. Set up a proportion where that ratio and the scale factor are equal to each other. Cross multiply and solve for x.

x/4 = 2/1

x = 8

The long side of the rectangle would measure 8.

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Q: How do you find the long side of a rectangle if you have the scale factor and short side?
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