If the ratio of onions to cilantro is 4:3 and I'm using 2/3 cup of onions, how much cilantro will I need?

4/3 = (2/3)/x

Cross multiply:
4x = 6/3 = 2
4x = 2
x = 1/2

4/3 = (2/3)/x

Cross multiply:
4x = 6/3 = 2
4x = 2
x = 1/2

To determine the amount of cilantro needed, we can set up a proportion based on the given ratio.

The ratio of onions to cilantro is given as 4:3. This means that for every 4 parts of onions, there are 3 parts of cilantro.

Now, we know that we will be using 2/3 cup of onions. To find the equivalent amount of cilantro, we can set up a proportion:

(onions / cilantro) = (2/3 cup / x cup)

Based on the given ratio of 4:3, we can write:

4/3 = 2/3 / x

Now, we can solve for x by cross-multiplying:

4x = 2
x = 2/4
x = 1/2

Therefore, you will need 1/2 cup of cilantro.