If the mean proportion of x2 and y2 is 4, then find the mean proportional of x3 and y3.
1). 2
2). 4
3). 8
4). 16
x2 : 4 = 4 : y2
x2y2 = 16
xy = 4
Let the mean proportional of x3 and y3 be a
a2 = x3y3
⇒ a = (4)3/2 = 8
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