81.72 is what percent of 1280 - 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 1280 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 1280, so we can write it down as 100%=1280.
4. We know, that x% equals 81.72 of the output value, so we can write it down as x%=81.72.
5. Now we have two simple equations:
1) 100%=1280
2) x%=81.72
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%=1280/81.72
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 81.72 is what percent of 1280

100%/x%=1280/81.72
(100/x)*x=(1280/81.72)*x       - we multiply both sides of the equation by x
100=15.663240332844*x       - we divide both sides of the equation by (15.663240332844) to get x
100/15.663240332844=x
6.384375=x
x=6.384375

now we have:
81.72 is 6.384375% of 1280