39.15 is what percent of 42.9 - 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 42.9 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 42.9, so we can write it down as 100%=42.9.
4. We know, that x% equals 39.15 of the output value, so we can write it down as x%=39.15.
5. Now we have two simple equations:
1) 100%=42.9
2) x%=39.15
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%=42.9/39.15
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 39.15 is what percent of 42.9

100%/x%=42.9/39.15
(100/x)*x=(42.9/39.15)*x       - we multiply both sides of the equation by x
100=1.095785440613*x       - we divide both sides of the equation by (1.095785440613) to get x
100/1.095785440613=x
91.258741258741=x
x=91.258741258741

now we have:
39.15 is 91.258741258741% of 42.9