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Finding the Fourth Proportional to 80,039.61, 120,061.58 and 20,873.97

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Solution

The fourth proportional to 80,039.61, 120,061.58 and 20,873.97 is: 31,311.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,039.61 : 120,061.58 = 20,873.97 : x
  2. Step 2: Convert to fraction form
    80,039.61/120,061.58 = 20,873.97/x
  3. Step 3: Cross multiply
    80,039.61x = 120,061.58 × 20,873.97
  4. Step 4: Simplify right side
    80,039.61x = 2,506,161,714.70
  5. Step 5: Solve for x
    x = 2,506,161,714.70/80,039.61
  6. Step 6: Final answer
    x = 31,311.52

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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.