## anonymous 4 years ago Twelve is the geometric mean of 9 and what number?

geometric mean of two numbers a and b is given by= $$\sqrt{ab}$$ here geometric mean is 12, a is 9 , we've to find b $12=\sqrt{9b}$ square both sides $144=9b$ divide both sides by 9 we get $16=b$ the other no. is 16