Finding the Third Proportional to 141.25 and 318.50

Step by Step Solution

1. Step 1: Write the proportion equation
   141.25 : 318.50 = 318.50 : x
2. Step 2: Convert to fraction form
   141.25/318.50 = 318.50/x
3. Step 3: Cross multiply
   141.25x = 318.50 × 318.50
4. Step 4: Simplify right side
   141.25x = 101,442.25
5. Step 5: Solve for x
   x = 101,442.25/141.25
6. Step 6: Final answer
   x = 718.18