19 is what percent of 810 - 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 810 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 810, so we can write it down as 100%=810.
4. We know, that x% equals 19 of the output value, so we can write it down as x%=19.
5. Now we have two simple equations:
1) 100%=810
2) x%=19
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%=810/19
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 19 is what percent of 810

100%/x%=810/19
(100/x)*x=(810/19)*x       - we multiply both sides of the equation by x
100=42.631578947368*x       - we divide both sides of the equation by (42.631578947368) to get x
100/42.631578947368=x
2.3456790123457=x
x=2.3456790123457

now we have:
19 is 2.3456790123457% of 810