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To enter percentages instead of dimensions, type an asterisk to indicate multiplication, followed by a number representing the scaling factor as a value less than 1 for reductions and larger than 1 for enlargements. You also can type in new measurements for both width and height, using the "Tab" key to move from width to height or "Shift-Tab" to move from height to width. Add the "Alt" key to the combination and the scaling process applies to a duplicate of the selection. When you hold down the "Ctrl" key while you press "Enter," the result scales proportionately instead.
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If you select and replace one of the current dimensions and press the "Enter" key to commit your change, the result scales disproportionately.
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Use Adobe Illustrator's Transform panel to scale objects when you know either the width or the height of your target size, expressed dimensionally or as a percentage.
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