Finding the Third Proportional to 281.50 and 440.50

Step by Step Solution

1. Step 1: Write the proportion equation
   281.50 : 440.50 = 440.50 : x
2. Step 2: Convert to fraction form
   281.50/440.50 = 440.50/x
3. Step 3: Cross multiply
   281.50x = 440.50 × 440.50
4. Step 4: Simplify right side
   281.50x = 194,040.25
5. Step 5: Solve for x
   x = 194,040.25/281.50
6. Step 6: Final answer
   x = 689.31