Finding the Third Proportional to 90.28 and 198.28

Step by Step Solution

1. Step 1: Write the proportion equation
   90.28 : 198.28 = 198.28 : x
2. Step 2: Convert to fraction form
   90.28/198.28 = 198.28/x
3. Step 3: Cross multiply
   90.28x = 198.28 × 198.28
4. Step 4: Simplify right side
   90.28x = 39,315.45
5. Step 5: Solve for x
   x = 39,315.45/90.28
6. Step 6: Final answer
   x = 435.48