Finding the Third Proportional to 64.25 and 143.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64.25 : 143.50 = 143.50 : x
2. Step 2: Convert to fraction form
   64.25/143.50 = 143.50/x
3. Step 3: Cross multiply
   64.25x = 143.50 × 143.50
4. Step 4: Simplify right side
   64.25x = 20,592.25
5. Step 5: Solve for x
   x = 20,592.25/64.25
6. Step 6: Final answer
   x = 320.50