If x+3, x-2, 6 and 5 are in proportion then find the mean proportional to x and 9x2.
=> (x + 3)/(x – 2) = 6/5 => 5x + 15 = 6x – 12 => x = 27 Mean proportional to x and 9x = √(x×9x) = 3x = 3×27 = 81
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