The mean proportional between 64 and 81 is:  

   (A) 48  

   (B) 68  

   (C) 72

   (D) None of these

Mean Proportional

Mean proportional of two numbers a and b is the square root of their product.

Solution:

  • Given numbers: 64 and 81
  • Mean proportional = √(64 * 81) = √(8 * 8 * 9 * 9) = 8 * 9 = 72

Therefore, the mean proportional between 64 and 81 is 72.

So, the correct answer is (C) 72.

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