The mean proportional of x and y is z. What is the mean proportional of x3 and y3?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. z3 .
Mean proportional of x and y = z = √(xy)
Mean proportional of x3 and y3 = √(x3y3) = (xy)(3/2) = (√(xy))³ = z³