To find the full value, we need to multiply 5/9 by some number. Let's call this number "x". Then we can write an equation:
5/9 * x = 90
To solve for "x", we can multiply both sides of the equation by 9/5:
x = 90 * 9/5
x = 162
Therefore, the full value is 162.
I hope this helps! Let me know if you have any other questions.