Finding the Third Proportional to 100.38 and 120.38

Step by Step Solution

1. Step 1: Write the proportion equation
   100.38 : 120.38 = 120.38 : x
2. Step 2: Convert to fraction form
   100.38/120.38 = 120.38/x
3. Step 3: Cross multiply
   100.38x = 120.38 × 120.38
4. Step 4: Simplify right side
   100.38x = 14,490.14
5. Step 5: Solve for x
   x = 14,490.14/100.38
6. Step 6: Final answer
   x = 144.36