Finding the Third Proportional to 151.56 and 321.16

Step by Step Solution

1. Step 1: Write the proportion equation
   151.56 : 321.16 = 321.16 : x
2. Step 2: Convert to fraction form
   151.56/321.16 = 321.16/x
3. Step 3: Cross multiply
   151.56x = 321.16 × 321.16
4. Step 4: Simplify right side
   151.56x = 103,141.34
5. Step 5: Solve for x
   x = 103,141.34/151.56
6. Step 6: Final answer
   x = 680.52