9.78 is what percent of 55 - 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 55 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 55, so we can write it down as 100%=55.
4. We know, that x% equals 9.78 of the output value, so we can write it down as x%=9.78.
5. Now we have two simple equations:
1) 100%=55
2) x%=9.78
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%=55/9.78
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 9.78 is what percent of 55

100%/x%=55/9.78
(100/x)*x=(55/9.78)*x       - we multiply both sides of the equation by x
100=5.6237218813906*x       - we divide both sides of the equation by (5.6237218813906) to get x
100/5.6237218813906=x
17.781818181818=x
x=17.781818181818

now we have:
9.78 is 17.781818181818% of 55