y : 51,1 = 11,2 : 34,4

To solve the proportion \( y : 51.1 = 11.2 : 34.4 \), we can use cross multiplication. This means we can set up the equation as follows:

\[ y \cdot 34.4 = 51.1 \cdot 11.2 \]

Now we will perform the calculations:

1. Calculate \( 51.1 \cdot 11.2 \): \[ 51.1 \cdot 11.2 = 573.32 \]

2. Now, substitute this value into the equation: \[ y \cdot 34.4 = 573.32 \]

3. To find \( y \), divide both sides by 34.4: \[ y = \frac{573.32}{34.4} \]

Now, calculate \( y \): \[ y \approx 16.67 \]

Thus, the solution is: \[ y \approx 16.67 \]