Finding the Third Proportional to 198.50 and 353.50

Step by Step Solution

1. Step 1: Write the proportion equation
   198.50 : 353.50 = 353.50 : x
2. Step 2: Convert to fraction form
   198.50/353.50 = 353.50/x
3. Step 3: Cross multiply
   198.50x = 353.50 × 353.50
4. Step 4: Simplify right side
   198.50x = 124,962.25
5. Step 5: Solve for x
   x = 124,962.25/198.50
6. Step 6: Final answer
   x = 629.53