Finding the Third Proportional to 1.31 and 2.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1.31 : 2.69 = 2.69 : x
2. Step 2: Convert to fraction form
   1.31/2.69 = 2.69/x
3. Step 3: Cross multiply
   1.31x = 2.69 × 2.69
4. Step 4: Simplify right side
   1.31x = 7.22
5. Step 5: Solve for x
   x = 7.22/1.31
6. Step 6: Final answer
   x = 5.50