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Finding the Fourth Proportional to 80,111.92, 120,168.28 and 20,947.72

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Solution

The fourth proportional to 80,111.92, 120,168.28 and 20,947.72 is: 31,421.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,111.92 : 120,168.28 = 20,947.72 : x
  2. Step 2: Convert to fraction form
    80,111.92/120,168.28 = 20,947.72/x
  3. Step 3: Cross multiply
    80,111.92x = 120,168.28 × 20,947.72
  4. Step 4: Simplify right side
    80,111.92x = 2,517,251,208.09
  5. Step 5: Solve for x
    x = 2,517,251,208.09/80,111.92
  6. Step 6: Final answer
    x = 31,421.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.