Finding the Third Proportional to 3.78 and 5.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3.78 : 5.31 = 5.31 : x
2. Step 2: Convert to fraction form
   3.78/5.31 = 5.31/x
3. Step 3: Cross multiply
   3.78x = 5.31 × 5.31
4. Step 4: Simplify right side
   3.78x = 28.25
5. Step 5: Solve for x
   x = 28.25/3.78
6. Step 6: Final answer
   x = 7.48