1. **State the problem:** We want to find the price of a 1.8 kg cheese block given that a 2.3 kg cheese block costs 394.75. 2. **Formula used:** Price is proportional to weight, so we use the unit price formula: $$\text{Unit price} = \frac{\text{Price}}{\text{Weight}}$$ 3. **Calculate the unit price:** $$\text{Unit price} = \frac{394.75}{2.3}$$ 4. **Calculate the price for 1.8 kg:** $$\text{Price for 1.8 kg} = \text{Unit price} \times 1.8 = \frac{394.75}{2.3} \times 1.8$$ 5. **Simplify the expression:** $$= 394.75 \times \frac{1.8}{2.3}$$ 6. **Calculate the numerical value:** $$= 394.75 \times 0.7826 \approx 308.91$$ **Final answer:** The price of a 1.8 kg cheese block is approximately 308.91.