324.4 is what percent of 390 - 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 390 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 390, so we can write it down as 100%=390.
4. We know, that x% equals 324.4 of the output value, so we can write it down as x%=324.4.
5. Now we have two simple equations:
1) 100%=390
2) x%=324.4
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%=390/324.4
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 324.4 is what percent of 390

100%/x%=390/324.4
(100/x)*x=(390/324.4)*x       - we multiply both sides of the equation by x
100=1.2022194821208*x       - we divide both sides of the equation by (1.2022194821208) to get x
100/1.2022194821208=x
83.179487179487=x
x=83.179487179487

now we have:
324.4 is 83.179487179487% of 390