Using proportions, it is found that the third diagram shows how much flour you need.
A proportion is a fraction of a total amount, and the measures are related using a rule of three. Due to this, relations between variables, either direct or inverse proportional, can be built to find the desired measures in the problem.
In this problem, we have that one batch takes 3/4 of a cup of flour. How many cups are needed for three batches? Applying the proportion and multiplying, we have that:
3 x 3/4 = 9/4 cups = 2 and 1/4 of cup.
Hence, researching the problem on the internet, the third diagram shows how much flour you need.
More can be learned about proportions at https://brainly.com/question/24372153
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