4,9:0,9

It seems like you're referencing a mathematical ratio or proportion, but it is not clear what you need help with specifically. The notation "4,9:0,9" could be interpreted in a couple of ways.

If this is meant to express a division, it could denote \( \frac{4.9}{0.9} \). If that's the case, you can simplify it:

1. Divide both numbers: \[ \frac{4.9}{0.9} = \frac{4.9 \times 10}{0.9 \times 10} = \frac{49}{9} \approx 5.4444 \]

If you're looking for something different regarding the ratio or have a specific question related to it, please provide more context!