Finding the Third Proportional to 287.25 and 514.50

Step by Step Solution

1. Step 1: Write the proportion equation
   287.25 : 514.50 = 514.50 : x
2. Step 2: Convert to fraction form
   287.25/514.50 = 514.50/x
3. Step 3: Cross multiply
   287.25x = 514.50 × 514.50
4. Step 4: Simplify right side
   287.25x = 264,710.25
5. Step 5: Solve for x
   x = 264,710.25/287.25
6. Step 6: Final answer
   x = 921.53