For a certain kind of plaster work, 1.9 cu yd of sand are needed for every 100 sq yd of surface. How much sand will be needed for 370 sq yd of surface? \( \square \) cu yd of sand will be needed for 370 sq yd of surface. (Simplify your answer.)

To find the amount of sand needed for 370 sq yd of surface, we can set up a proportion based on the given ratio. Since 1.9 cu yd of sand is needed for every 100 sq yd, we calculate the amount needed for 370 sq yd by: \[ \text{Amount of sand} = \frac{1.9 \text{ cu yd}}{100 \text{ sq yd}} \times 370 \text{ sq yd} = \frac{1.9 \times 370}{100} \] \[ = \frac{703}{100} = 7.03 \text{ cu yd} \] So, you will need 7.03 cu yd of sand for 370 sq yd of surface.