Remain proportional transformation

When you use the Transform palette (Window>Transform) to change the size of an object, you can enter the width and the height for a selected object and press Return (PC: Enter). Another option is to enter either width or height and keep the other measurement proportionate by pressing Command-Return (PC: Control-Enter). For example, if your object is 1.5 inches high by 3 inches wide, change the width from 3 to 6 inches and press Command-Return (PC: Control- Enter), and the height will automatically change to 3 inches.

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