Finding the Third Proportional to 313.31 and 348.56

Step by Step Solution

1. Step 1: Write the proportion equation
   313.31 : 348.56 = 348.56 : x
2. Step 2: Convert to fraction form
   313.31/348.56 = 348.56/x
3. Step 3: Cross multiply
   313.31x = 348.56 × 348.56
4. Step 4: Simplify right side
   313.31x = 121,495.82
5. Step 5: Solve for x
   x = 121,495.82/313.31
6. Step 6: Final answer
   x = 387.78