39 is what percent of 28.78 - 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 28.78 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 28.78, so we can write it down as 100%=28.78.
4. We know, that x% equals 39 of the output value, so we can write it down as x%=39.
5. Now we have two simple equations:
1) 100%=28.78
2) x%=39
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%=28.78/39
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 39 is what percent of 28.78

100%/x%=28.78/39
(100/x)*x=(28.78/39)*x       - we multiply both sides of the equation by x
100=0.73794871794872*x       - we divide both sides of the equation by (0.73794871794872) to get x
100/0.73794871794872=x
135.51077136901=x
x=135.51077136901

now we have:
39 is 135.51077136901% of 28.78