Finding the Third Proportional to 150.50 and 315.25

Step by Step Solution

1. Step 1: Write the proportion equation
   150.50 : 315.25 = 315.25 : x
2. Step 2: Convert to fraction form
   150.50/315.25 = 315.25/x
3. Step 3: Cross multiply
   150.50x = 315.25 × 315.25
4. Step 4: Simplify right side
   150.50x = 99,382.56
5. Step 5: Solve for x
   x = 99,382.56/150.50
6. Step 6: Final answer
   x = 660.35