Finding the Third Proportional to 118.50 and 275.25

Step by Step Solution

1. Step 1: Write the proportion equation
   118.50 : 275.25 = 275.25 : x
2. Step 2: Convert to fraction form
   118.50/275.25 = 275.25/x
3. Step 3: Cross multiply
   118.50x = 275.25 × 275.25
4. Step 4: Simplify right side
   118.50x = 75,762.56
5. Step 5: Solve for x
   x = 75,762.56/118.50
6. Step 6: Final answer
   x = 639.35