6.39 is what percent of 8.6 - 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 8.6 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 8.6, so we can write it down as 100%=8.6.
4. We know, that x% equals 6.39 of the output value, so we can write it down as x%=6.39.
5. Now we have two simple equations:
1) 100%=8.6
2) x%=6.39
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%=8.6/6.39
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 6.39 is what percent of 8.6

100%/x%=8.6/6.39
(100/x)*x=(8.6/6.39)*x       - we multiply both sides of the equation by x
100=1.3458528951487*x       - we divide both sides of the equation by (1.3458528951487) to get x
100/1.3458528951487=x
74.302325581395=x
x=74.302325581395

now we have:
6.39 is 74.302325581395% of 8.6