Finding the Third Proportional to 0.12 and 0.72

Step by Step Solution

1. Step 1: Write the proportion equation
   0.12 : 0.72 = 0.72 : x
2. Step 2: Convert to fraction form
   0.12/0.72 = 0.72/x
3. Step 3: Cross multiply
   0.12x = 0.72 × 0.72
4. Step 4: Simplify right side
   0.12x = 0.52
5. Step 5: Solve for x
   x = 0.52/0.12
6. Step 6: Final answer
   x = 4.22