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Let mean proportion between 1/4 and 1/25 is x
So 1/4 : x :: x : 1/25
=> (1/4)*(1/25) = x*x
=> 1/100 = x2
=> x = √(1/100)
=> x = 1/10
So, the mean proportion between 1/4 and 1/25 is 10