For a proportional relationship, there must be a constant ratio between x and y. This means the relationship between the two variables should be of the form
![y=kx](https://img.qammunity.org/2023/formulas/mathematics/college/zfnjlk9kn7jg7cyy0nlnepmsiaxj3b2oge.png)
where k is any constant.
Now, in our case of y = 3/4 x, we see that y and x are related by a constant 3/4 which means there is a constant ratio between the two variables; therefore, the relationship is proportional.