Finding the Third Proportional to 50.50 and 80.50

Step by Step Solution

1. Step 1: Write the proportion equation
   50.50 : 80.50 = 80.50 : x
2. Step 2: Convert to fraction form
   50.50/80.50 = 80.50/x
3. Step 3: Cross multiply
   50.50x = 80.50 × 80.50
4. Step 4: Simplify right side
   50.50x = 6,480.25
5. Step 5: Solve for x
   x = 6,480.25/50.50
6. Step 6: Final answer
   x = 128.32