Number must be added to each of the numbers 15, 17, 34 and 38.

What number must be added to each of the numbers 15, 17, 34, and 38 to make them proportional?

Solution:

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.

Solution:

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