Suppose that `y` is directly proportional to `x`.

Find the constant of proportionality `k` if `y = 43.2` when `x = 18`.

`k` = (Write your answer as a decimal.)

Using the `k` from above write the variation equation in terms of `x`.

`y` =

Using the `k` from above find `y` given that `x = 40`.

`y` =

If needed, round answer to 3 decimal places.
Enter DNE for Does Not Exist, `oo` for Infinity