Find two numbers such that the mean proportional between them is 14 and the third proportional to them is 112.
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Find the third proportional to a2 - b2 and a + b.
Find the mean proportion to (x - y) and (x3 - x2y)
If x and y be unequal and x : y is the duplicate ratio of x + z and y + z, prove that z is mean proportional between x and y.