Home / 139.29-192.20-81.06

Finding the Fourth Proportional to 139.29, 192.20 and 81.06

Calculator

Solution

The fourth proportional to 139.29, 192.20 and 81.06 is: 111.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.29 : 192.20 = 81.06 : x
  2. Step 2: Convert to fraction form
    139.29/192.20 = 81.06/x
  3. Step 3: Cross multiply
    139.29x = 192.20 × 81.06
  4. Step 4: Simplify right side
    139.29x = 15,579.73
  5. Step 5: Solve for x
    x = 15,579.73/139.29
  6. Step 6: Final answer
    x = 111.85

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.