I agree with Vivian. Four times greater than is the same as five times as much.
If my salary is 1/2 that of my next door neighbor, than his salary is twice of mine. His salary is not two times greater than mine, because than it would be three times as much.
If you are having trouble with this interpretation, consider one person to have a salary of 10,000 per month while another employee of the same company has a salary of 11,000 per month. You would not say that the higher salary was 1.1 times greater than the lower salary, but only 10% greater (or 1.1 times as much).
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