M is directly proportional to r cubed when r = 4 m = 160 work out the value of r when m = 540

So we use a technique called Ratios. If the ratio of r:m = 4:160. We can work out how we can get r if m is equal to 540. First lets make the ratio for it -

r:540. Now we need to get the number 540 and divide it by 160, this will tell us how much we need to multiply by. 540/160 = 4. So now we know that our multiplier is 4. Then we need to multiply 4 by 4. That gives us 16 therefore the answer to this question is 16.

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