**Step 1:** Put together the general equation.

**Step 2:** Solve for the constant of
proportionality.

**Step 3:** Plugging the constant into the equation, solve for the
unknown variable.

Let's solve a few problems to see how this works, shall we?

**Example 1:** Y is directly proportional to x. When x = 5, y = 8.
What does y equal when x = 9?

y = cx

where c is the constant of proportionality. In other words, when x goes up, y goes up, and when x goes down, y goes down.

The next thing we do is plug our values for x and y into the equation so we can solve for c:

8 = (c)(5)

Solving for c, we get c = 8/5 = 1.6 and we plug this into our equation:

y = 1.6x

Now, we can plug x = 9 into the equation to find out what y equals:

y = (1.6)(9)

y = 14.4

So, our answer is 14.4

**Example 2:** Y is directly proportional to the square of x.
When x = 2, y = 32. What does y equal when x = 5?

This time, our general equation is slightly more complicated because x is squared:

y = cx^{2}

Like before, we solve for our constant:

32 = (c)(2^{2})

32 = (c)(4)

We get c = 8:

y = 8x^{2}

Solving for y when x = 5, we get
y = (8)(5^{2}) = (8)(25) = 200

**Example 3:** Y is inversely proportional to x. When x = 2, y = 8.
What does y equal when x = 24?

This time, because y is inversely proportional to x, our general equation is different:

xy = c

so when x goes up, y goes down, and vise versa. But, other than that, we solve these kinds of problems the same way as direct proportion problems. Solving for the constant, we get:

(2)(8) = c

So c = 16 and our equation is now:

xy = 16

Solving for y when x = 24 we get y = 16/24 = 2/3

**Example 4:** Y is inversely proportional to the square root of x.
When x = 36, y = 2. What does y equal when x = 64?

As before, we set up our equation:

Since the square root of 36 is 6, it is easy to solve for c:

(6)(2) = c

We get c = 12 and our equation is now:

Solving for y when x = 64 we get 8y = 12 or y = 12/8 = 1.5 because the square root of 64 is 8.

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