423.9 is what percent of 540 - 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 540 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 540, so we can write it down as 100%=540.
4. We know, that x% equals 423.9 of the output value, so we can write it down as x%=423.9.
5. Now we have two simple equations:
1) 100%=540
2) x%=423.9
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%=540/423.9
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 423.9 is what percent of 540

100%/x%=540/423.9
(100/x)*x=(540/423.9)*x       - we multiply both sides of the equation by x
100=1.2738853503185*x       - we divide both sides of the equation by (1.2738853503185) to get x
100/1.2738853503185=x
78.5=x
x=78.5

now we have:
423.9 is 78.5% of 540