641.2 is what percent of 1571.2 - 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 1571.2 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 1571.2, so we can write it down as 100%=1571.2.
4. We know, that x% equals 641.2 of the output value, so we can write it down as x%=641.2.
5. Now we have two simple equations:
1) 100%=1571.2
2) x%=641.2
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%=1571.2/641.2
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 641.2 is what percent of 1571.2

100%/x%=1571.2/641.2
(100/x)*x=(1571.2/641.2)*x       - we multiply both sides of the equation by x
100=2.4504054897068*x       - we divide both sides of the equation by (2.4504054897068) to get x
100/2.4504054897068=x
40.809572301426=x
x=40.809572301426

now we have:
641.2 is 40.809572301426% of 1571.2