1. We start with the given ratio $4.10:1.90$. 2. To express this ratio in the form $n:1$, we divide both parts of the ratio by the second number $1.90$. 3. Calculate $n = \frac{4.10}{1.90}$. 4. Simplify the division: $$n = \frac{4.10}{1.90} = 2.1578947368421053 \approx 2.16.$$ 5. Therefore, the ratio $4.10:1.90$ expressed in the form $n:1$ is approximately $2.16:1$.