Finding the Third Proportional to 90.20 and 143.41

Step by Step Solution

1. Step 1: Write the proportion equation
   90.20 : 143.41 = 143.41 : x
2. Step 2: Convert to fraction form
   90.20/143.41 = 143.41/x
3. Step 3: Cross multiply
   90.20x = 143.41 × 143.41
4. Step 4: Simplify right side
   90.20x = 20,566.75
5. Step 5: Solve for x
   x = 20,566.75/90.20
6. Step 6: Final answer
   x = 228.01