Finding the Third Proportional to 287.50 and 457.25

Step by Step Solution

1. Step 1: Write the proportion equation
   287.50 : 457.25 = 457.25 : x
2. Step 2: Convert to fraction form
   287.50/457.25 = 457.25/x
3. Step 3: Cross multiply
   287.50x = 457.25 × 457.25
4. Step 4: Simplify right side
   287.50x = 209,077.56
5. Step 5: Solve for x
   x = 209,077.56/287.50
6. Step 6: Final answer
   x = 727.23