Finding the Third Proportional to 315.50 and 487.25

Step by Step Solution

1. Step 1: Write the proportion equation
   315.50 : 487.25 = 487.25 : x
2. Step 2: Convert to fraction form
   315.50/487.25 = 487.25/x
3. Step 3: Cross multiply
   315.50x = 487.25 × 487.25
4. Step 4: Simplify right side
   315.50x = 237,412.56
5. Step 5: Solve for x
   x = 237,412.56/315.50
6. Step 6: Final answer
   x = 752.50