Finding the Third Proportional to 155.50 and 280.75

Step by Step Solution

1. Step 1: Write the proportion equation
   155.50 : 280.75 = 280.75 : x
2. Step 2: Convert to fraction form
   155.50/280.75 = 280.75/x
3. Step 3: Cross multiply
   155.50x = 280.75 × 280.75
4. Step 4: Simplify right side
   155.50x = 78,820.56
5. Step 5: Solve for x
   x = 78,820.56/155.50
6. Step 6: Final answer
   x = 506.88