The variable z is directly proportional to x, and inversely proportional to y. when x is 3 and y is 14, z has the value 3.8571428571429.

what is the value of z when x = 12, and y = 23

To determine the z in this proportional equation. We used first understand the formula and equation by understanding the relationships between z, x and y then we apply the values or numbers and undergo the process of finding the asked unknown value.
1.      Since z is directly proportional to x and inversely proportional with Y. we have the equation set as: Z = X / Y
2.      Hence if the given values of X = 12, and Y = 23. Then apply the values in the formula we have:
a.       Z = X / Y
b.      Z = 12 / 23
c.       Z = 0.522