The first ratio, 3/8 to 15/24, simplifies to 3/8 = 15/24. It can be simplified further by dividing both numerator and denominator by 3 to get 1/8 = 5/8.

The second ratio, 7.11/12 to 3.1/6, can be converted to common fractions as 711/100 to 31/10. Next, cross multiply to get 7110 = 3100.

The third ratio, 15/16 to 10/48, simplifies to 15/16 = 10/48. This can be simplified further by dividing both by 2 to get 15/16 = 5/24.

Overall, the ratios are: