39 is what percent of 127.8 - 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 127.8 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 127.8, so we can write it down as 100%=127.8.
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%=127.8
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%=127.8/39
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 127.8

100%/x%=127.8/39
(100/x)*x=(127.8/39)*x       - we multiply both sides of the equation by x
100=3.2769230769231*x       - we divide both sides of the equation by (3.2769230769231) to get x
100/3.2769230769231=x
30.516431924883=x
x=30.516431924883

now we have:
39 is 30.516431924883% of 127.8