₽ 4,3 : 2,25=y : 3,5

To solve the equation \( \frac{4.3}{2.25} = \frac{y}{3.5} \), we can cross-multiply.

Cross-multiplying gives us: \[ 4.3 \times 3.5 = 2.25 \times y \]

Now, we need to calculate \( 4.3 \times 3.5 \): \[ 4.3 \times 3.5 = 15.05 \]

So we have: \[ 15.05 = 2.25 \times y \]

Next, we solve for \( y \): \[ y = \frac{15.05}{2.25} \]

Calculating \( \frac{15.05}{2.25} \): \[ y \approx 6.68 \]

Thus, the value of \( y \) is approximately \( 6.68 \).