Finding the Third Proportional to 151.56 and 221.17

Step by Step Solution

1. Step 1: Write the proportion equation
   151.56 : 221.17 = 221.17 : x
2. Step 2: Convert to fraction form
   151.56/221.17 = 221.17/x
3. Step 3: Cross multiply
   151.56x = 221.17 × 221.17
4. Step 4: Simplify right side
   151.56x = 48,915.27
5. Step 5: Solve for x
   x = 48,915.27/151.56
6. Step 6: Final answer
   x = 322.75