is 3 fifths and 30 18's proportional?

No.

3/5 does not equal 30/18

However, 3/5 is 18/30

To determine if two fractions are proportional, you need to check if their ratios are equal. In this case, the two fractions are:

3 fifths = 3/5
30 18's = 30/18

To compare these two fractions, we need to find their common denominator. The least common multiple of 5 and 18 is 90. We can then convert both fractions to have this common denominator:

3/5 = (3/5) * (18/18) = 54/90
30/18 = (30/18) * (5/5) = 150/90

Now that both fractions have the same denominator, we can check if their ratios are equal:

54/90 ?=? 150/90

By comparing the numerators, we see that 54 is not equal to 150. Therefore, 3 fifths and 30 18's are not proportional.