Finding the Third Proportional to 261.56 and 381.38

Step by Step Solution

1. Step 1: Write the proportion equation
   261.56 : 381.38 = 381.38 : x
2. Step 2: Convert to fraction form
   261.56/381.38 = 381.38/x
3. Step 3: Cross multiply
   261.56x = 381.38 × 381.38
4. Step 4: Simplify right side
   261.56x = 145,446.89
5. Step 5: Solve for x
   x = 145,446.89/261.56
6. Step 6: Final answer
   x = 556.07