Finding the Third Proportional to 90.75 and 141.25

Step by Step Solution

1. Step 1: Write the proportion equation
   90.75 : 141.25 = 141.25 : x
2. Step 2: Convert to fraction form
   90.75/141.25 = 141.25/x
3. Step 3: Cross multiply
   90.75x = 141.25 × 141.25
4. Step 4: Simplify right side
   90.75x = 19,951.56
5. Step 5: Solve for x
   x = 19,951.56/90.75
6. Step 6: Final answer
   x = 219.85