4:16/19

It seems like you've provided a fraction or a ratio: \( \frac{4:16}{19} \). However, it's unclear what you would like to do with it.

If you are looking to simplify \( \frac{4}{16} \):

1. Simplify \( \frac{4}{16} \) to \( \frac{1}{4} \).
2. If you want to express it as a ratio with 19, it would depend on what you're trying to compare or calculate.

Could you please clarify what you need help with regarding the numbers you provided?