If a, b, c, d, e are in continued proportion, prove that a : e = a4 : b4.
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If (a + 2b + c), (a - c) and (a - 2b + c) are in continued proportion, prove that b is the mean proportional between a and c.
If 2, 6, p, 54 and q are in continued proportion, find the values of p and q.
Find two numbers whose mean proportional is 16 and the third proportional is 128.