639.72 is what percent of 720.12 - 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 720.12 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 720.12, so we can write it down as 100%=720.12.
4. We know, that x% equals 639.72 of the output value, so we can write it down as x%=639.72.
5. Now we have two simple equations:
1) 100%=720.12
2) x%=639.72
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%=720.12/639.72
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 639.72 is what percent of 720.12

100%/x%=720.12/639.72
(100/x)*x=(720.12/639.72)*x       - we multiply both sides of the equation by x
100=1.1256799849934*x       - we divide both sides of the equation by (1.1256799849934) to get x
100/1.1256799849934=x
88.835194134311=x
x=88.835194134311

now we have:
639.72 is 88.835194134311% of 720.12