Finding the Third Proportional to 139.94 and 221.47

Step by Step Solution

1. Step 1: Write the proportion equation
   139.94 : 221.47 = 221.47 : x
2. Step 2: Convert to fraction form
   139.94/221.47 = 221.47/x
3. Step 3: Cross multiply
   139.94x = 221.47 × 221.47
4. Step 4: Simplify right side
   139.94x = 49,048.41
5. Step 5: Solve for x
   x = 49,048.41/139.94
6. Step 6: Final answer
   x = 350.50