If x + 5 is the mean proportion between x + 2 and x + 9; find the value of x.
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Find the mean proportional between a - b and a3 - a2b
If x2, 4 and 9 are in continued proportion, find x.
If y is the mean proportional between x and z; show that xy + yz is the mean proportional between x2 + y2 and y2 + z2.