Finding the Third Proportional to 143.25 and 313.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143.25 : 313.50 = 313.50 : x
2. Step 2: Convert to fraction form
   143.25/313.50 = 313.50/x
3. Step 3: Cross multiply
   143.25x = 313.50 × 313.50
4. Step 4: Simplify right side
   143.25x = 98,282.25
5. Step 5: Solve for x
   x = 98,282.25/143.25
6. Step 6: Final answer
   x = 686.09