Finding the Third Proportional to 144.75 and 309.38

Step by Step Solution

1. Step 1: Write the proportion equation
   144.75 : 309.38 = 309.38 : x
2. Step 2: Convert to fraction form
   144.75/309.38 = 309.38/x
3. Step 3: Cross multiply
   144.75x = 309.38 × 309.38
4. Step 4: Simplify right side
   144.75x = 95,712.89
5. Step 5: Solve for x
   x = 95,712.89/144.75
6. Step 6: Final answer
   x = 661.23