42.4 is what percent of 318.9 - step by step solution

To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 318.9 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for.
3. If 100% equals 318.9, so we can write it down as 100%=318.9.
4. We know, that x% equals 42.4 of the output value, so we can write it down as x%=42.4.
5. Now we have two simple equations:
1) 100%=318.9
2) x%=42.4
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
100%/x%=318.9/42.4
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 42.4 is what percent of 318.9

100%/x%=318.9/42.4
(100/x)*x=(318.9/42.4)*x       - we multiply both sides of the equation by x
100=7.5212264150943*x       - we divide both sides of the equation by (7.5212264150943) to get x
100/7.5212264150943=x
13.29570398244=x
x=13.29570398244

now we have:
42.4 is 13.29570398244% of 318.9