19.85 is what percent of 15.4 - 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 15.4 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 15.4, so we can write it down as 100%=15.4.
4. We know, that x% equals 19.85 of the output value, so we can write it down as x%=19.85.
5. Now we have two simple equations:
1) 100%=15.4
2) x%=19.85
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%=15.4/19.85
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 19.85 is what percent of 15.4

100%/x%=15.4/19.85
(100/x)*x=(15.4/19.85)*x       - we multiply both sides of the equation by x
100=0.77581863979849*x       - we divide both sides of the equation by (0.77581863979849) to get x
100/0.77581863979849=x
128.8961038961=x
x=128.8961038961

now we have:
19.85 is 128.8961038961% of 15.4