Find the unit rate.
4 grams for every $\frac{3}{4}$ serving

The unit rate is $[I$ grams per serving.

Step 1 ：The problem is asking for the unit rate, which is a way of comparing quantities when they are not the same. In this case, we are comparing grams to servings.

Step 2 ：To find the unit rate, we need to divide the number of grams by the number of servings. Since the number of servings is given as a fraction, we will need to divide 4 by 3/4. This is equivalent to multiplying 4 by the reciprocal of 3/4, which is 4/3.

Step 3 ：Performing the calculation, we find that the unit rate is approximately 5.33. This means that for every serving, there are about 5.33 grams.

Step 4 ：Final Answer: The unit rate is approximately \(\boxed{5.33}\) grams per serving.