Finding the Third Proportional to 400.50 and 498.38

Step by Step Solution

1. Step 1: Write the proportion equation
   400.50 : 498.38 = 498.38 : x
2. Step 2: Convert to fraction form
   400.50/498.38 = 498.38/x
3. Step 3: Cross multiply
   400.50x = 498.38 × 498.38
4. Step 4: Simplify right side
   400.50x = 248,377.64
5. Step 5: Solve for x
   x = 248,377.64/400.50
6. Step 6: Final answer
   x = 620.17