√(18):√(50) = 3√(2) : 5√(2) = 3 : 5
the square root of 18;the square root of 50
you simplify the answer and get...
3 (square root of 2); 5 (square root of 2)
you cancel out the square roots of 2 because they'r the same on both sides...
then you get that the ratio is 3;5.
i hope i helped c: