Which of the following rational numbers is equal to 3.1? 22/9, 24/9, 26/9, 28/9

To find the rational number equivalent to 3.1, we convert 3.1 into a fraction with a denominator of 10. We multiply both the numerator and the denominator of 3.1 by 10 to get 31/10.

Out of the given options, the only rational number equal to 3.1 (or 31/10) is 28/9. Therefore, the correct answer is 28/9.