Finding the Third Proportional to 15.71 and 34.28

Step by Step Solution

1. Step 1: Write the proportion equation
   15.71 : 34.28 = 34.28 : x
2. Step 2: Convert to fraction form
   15.71/34.28 = 34.28/x
3. Step 3: Cross multiply
   15.71x = 34.28 × 34.28
4. Step 4: Simplify right side
   15.71x = 1,174.94
5. Step 5: Solve for x
   x = 1,174.94/15.71
6. Step 6: Final answer
   x = 74.77