Finding the Third Proportional to 3.53 and 5.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3.53 : 5.31 = 5.31 : x
2. Step 2: Convert to fraction form
   3.53/5.31 = 5.31/x
3. Step 3: Cross multiply
   3.53x = 5.31 × 5.31
4. Step 4: Simplify right side
   3.53x = 28.22
5. Step 5: Solve for x
   x = 28.22/3.53
6. Step 6: Final answer
   x = 7.99