Finding the Third Proportional to 143.50 and 388

Step by Step Solution

1. Step 1: Write the proportion equation
   143.50 : 388 = 388 : x
2. Step 2: Convert to fraction form
   143.50/388 = 388/x
3. Step 3: Cross multiply
   143.50x = 388 × 388
4. Step 4: Simplify right side
   143.50x = 150,544
5. Step 5: Solve for x
   x = 150,544/143.50
6. Step 6: Final answer
   x = 1,049.09