Finding the Third Proportional to 90.28 and 200.81

Step by Step Solution

1. Step 1: Write the proportion equation
   90.28 : 200.81 = 200.81 : x
2. Step 2: Convert to fraction form
   90.28/200.81 = 200.81/x
3. Step 3: Cross multiply
   90.28x = 200.81 × 200.81
4. Step 4: Simplify right side
   90.28x = 40,325.66
5. Step 5: Solve for x
   x = 40,325.66/90.28
6. Step 6: Final answer
   x = 446.67