**Guide :High School **

# The variable Z is directly proportional to X. When X is 12, Z has the value 36. What is the value of Z when X = 19

The variable Z is directly proportional to X. When X is 12, Z has the value 36. What is the value of Z when X = 19**The easiest way to solve this is to make a proportion problem. Here is what we have so far... = cross multiply 12z = 36 × 1912z = 684z = 57**...