Finding the Third Proportional to 259.31 and 381.38

Step by Step Solution

1. Step 1: Write the proportion equation
   259.31 : 381.38 = 381.38 : x
2. Step 2: Convert to fraction form
   259.31/381.38 = 381.38/x
3. Step 3: Cross multiply
   259.31x = 381.38 × 381.38
4. Step 4: Simplify right side
   259.31x = 145,446.89
5. Step 5: Solve for x
   x = 145,446.89/259.31
6. Step 6: Final answer
   x = 560.89