Natalie has 54 blue marbles out of a total of 144 marbles. In Alexis's bag of marbles, 3/8 of the marbles are blue. Is the ratio of blue marbles to the total number of marbles the same for both bags?

54 / 144 = 3/8 ?

It does so yes the ratio of blue marbles to the total number of marbles is the same for both bags.