Finding the Third Proportional to 144.47 and 217.31

Step by Step Solution

1. Step 1: Write the proportion equation
   144.47 : 217.31 = 217.31 : x
2. Step 2: Convert to fraction form
   144.47/217.31 = 217.31/x
3. Step 3: Cross multiply
   144.47x = 217.31 × 217.31
4. Step 4: Simplify right side
   144.47x = 47,224.72
5. Step 5: Solve for x
   x = 47,224.72/144.47
6. Step 6: Final answer
   x = 326.89