128.86 is what percent of 515.45 - 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 515.45 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 515.45, so we can write it down as 100%=515.45.
4. We know, that x% equals 128.86 of the output value, so we can write it down as x%=128.86.
5. Now we have two simple equations:
1) 100%=515.45
2) x%=128.86
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%=515.45/128.86
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 128.86 is what percent of 515.45

100%/x%=515.45/128.86
(100/x)*x=(515.45/128.86)*x       - we multiply both sides of the equation by x
100=4.0000776036008*x       - we divide both sides of the equation by (4.0000776036008) to get x
100/4.0000776036008=x
24.999514986905=x
x=24.999514986905

now we have:
128.86 is 24.999514986905% of 515.45