The mean proportional between 36 and 9 is:A12B18C9D24Answer: B. 18 Read Explanation: The mean proportional between two numbers (a) and (b) is:a×b\sqrt{a \times b}a×bGiven: 36 and 936×9=324=18\sqrt{36 \times 9} = \sqrt{324} = 1836×9=324=18Final Answer: 18 Read more in App