Which positive number should replace both question marks in the following equation?
​$$\frac{?}{56} = \frac{504}{?}$$​

Correct option is C

Given: ​

​$$\frac{?}{56} = \frac{504}{?}$$ 

Solution: ​

​$$\frac{?}{56} = \frac{504}{?} \\ \ \\ (?)^2 = 56 \times 504 \\ \ \\ ? = \sqrt{ 56 \times 504} \\ \ \\ ? = 168$$​​