9.21 is what percent of 19.9 - 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 19.9 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 19.9, so we can write it down as 100%=19.9.
4. We know, that x% equals 9.21 of the output value, so we can write it down as x%=9.21.
5. Now we have two simple equations:
1) 100%=19.9
2) x%=9.21
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%=19.9/9.21
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 9.21 is what percent of 19.9

100%/x%=19.9/9.21
(100/x)*x=(19.9/9.21)*x       - we multiply both sides of the equation by x
100=2.1606948968512*x       - we divide both sides of the equation by (2.1606948968512) to get x
100/2.1606948968512=x
46.281407035176=x
x=46.281407035176

now we have:
9.21 is 46.281407035176% of 19.9