Which one is correct?

Zachariah and Khai collect stamps. Zachariah has 7 American stamps out of 12 stamps. Khai has 15 American stamps out of 24 stamps. Which statement is correct?

Zachariah has a higher ratio of American stamps than Khai because 7 over 12 is greater than 15 over 24.

Khai has a higher ratio of American stamps than Zachariah because 7 over 12 is less than 15 over 24.

Zachariah has a higher ratio of American stamps than Khai because 7 over 12 is less than 15 over 24.

Zachariah and Khai have the same ratio of American stamps.