Finding the Third Proportional to 155.43 and 171.57

Step by Step Solution

1. Step 1: Write the proportion equation
   155.43 : 171.57 = 171.57 : x
2. Step 2: Convert to fraction form
   155.43/171.57 = 171.57/x
3. Step 3: Cross multiply
   155.43x = 171.57 × 171.57
4. Step 4: Simplify right side
   155.43x = 29,436.71
5. Step 5: Solve for x
   x = 29,436.71/155.43
6. Step 6: Final answer
   x = 189.38