(C) Let the third number be $x$.The first number is $20 \%$ more than $x$,which is $x + 0.20x = 1.2x$.The second number is $50 \%$ more than $x$,which

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(C) Let the third number be $x$.The first number is $20 \%$ more than $x$,which is $x + 0.20x = 1.2x$.The second number is $50 \%$ more than $x$,which is $x + 0.50x = 1.5x$.The ratio of the two numbers is $\frac{1.2x}{1.5x} = \frac{1.2}{1.5} = \frac{12}{15} = \frac{4}{5}$.Therefore,the ratio is $4:5$.