If 25 is the mean proportion between 5 and X, then X is equal to____.

125

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12.5

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Solution

The correct option is A 125
If three numbers are in continuous proportion then the middle number is called mean proportion. So if 25 is the mean proportion between 5 and 125 then
5/25 = 25/X
=> X = (25 * 25)/ 5
=> X = 125

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