583.2 is what percent of 640 - 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 640 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 640, so we can write it down as 100%=640.
4. We know, that x% equals 583.2 of the output value, so we can write it down as x%=583.2.
5. Now we have two simple equations:
1) 100%=640
2) x%=583.2
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%=640/583.2
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 583.2 is what percent of 640

100%/x%=640/583.2
(100/x)*x=(640/583.2)*x       - we multiply both sides of the equation by x
100=1.0973936899863*x       - we divide both sides of the equation by (1.0973936899863) to get x
100/1.0973936899863=x
91.125=x
x=91.125

now we have:
583.2 is 91.125% of 640