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Mean proportion of two numbers 'p' and 'q' is √(p X q) .
So, 'a' = √(12.8 X 0.8)
Or, 'a' = √10.24 = 3.2
Third proportional to two numbers 'p' and 'q' is (q2/p) .
So, 'b' = (4.82/1.2)
Or, 'b' = (23.04/1.2) = 19.2
Required ratio = (3.2 + 19.2) :(19.2 - 3.2) = 22.4:16 = 7:5
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