128.89 is what percent of 307.9 - 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 307.9 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 307.9, so we can write it down as 100%=307.9.
4. We know, that x% equals 128.89 of the output value, so we can write it down as x%=128.89.
5. Now we have two simple equations:
1) 100%=307.9
2) x%=128.89
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%=307.9/128.89
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 128.89 is what percent of 307.9

100%/x%=307.9/128.89
(100/x)*x=(307.9/128.89)*x       - we multiply both sides of the equation by x
100=2.3888587167352*x       - we divide both sides of the equation by (2.3888587167352) to get x
100/2.3888587167352=x
41.860993829165=x
x=41.860993829165

now we have:
128.89 is 41.860993829165% of 307.9