Finding the Third Proportional to 64.50 and 143.38

Step by Step Solution

1. Step 1: Write the proportion equation
   64.50 : 143.38 = 143.38 : x
2. Step 2: Convert to fraction form
   64.50/143.38 = 143.38/x
3. Step 3: Cross multiply
   64.50x = 143.38 × 143.38
4. Step 4: Simplify right side
   64.50x = 20,556.39
5. Step 5: Solve for x
   x = 20,556.39/64.50
6. Step 6: Final answer
   x = 318.70