The mean proportional between 68 and 272 is:A114B136C126D124Answer: B. 136 Read Explanation: The mean proportional (geometric mean) between two numbers (a) and (b) is:a×b\sqrt{a \times b}a×b Apply formula68×272\sqrt{68 \times 272}68×27268×272=1849668 \times 272 = 1849668×272=18496Square root18496=136\sqrt{18496} = 13618496=136Final Answer: 136 Read more in App