20.4 is what percent of 20.9 - 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 20.9 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 20.9, so we can write it down as 100%=20.9.
4. We know, that x% equals 20.4 of the output value, so we can write it down as x%=20.4.
5. Now we have two simple equations:
1) 100%=20.9
2) x%=20.4
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%=20.9/20.4
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 20.4 is what percent of 20.9

100%/x%=20.9/20.4
(100/x)*x=(20.9/20.4)*x       - we multiply both sides of the equation by x
100=1.0245098039216*x       - we divide both sides of the equation by (1.0245098039216) to get x
100/1.0245098039216=x
97.607655502392=x
x=97.607655502392

now we have:
20.4 is 97.607655502392% of 20.9