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Finding the Fourth Proportional to 80,662.96, 120,994.02 and 20,691.18

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Solution

The fourth proportional to 80,662.96, 120,994.02 and 20,691.18 is: 31,036.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,662.96 : 120,994.02 = 20,691.18 : x
  2. Step 2: Convert to fraction form
    80,662.96/120,994.02 = 20,691.18/x
  3. Step 3: Cross multiply
    80,662.96x = 120,994.02 × 20,691.18
  4. Step 4: Simplify right side
    80,662.96x = 2,503,509,046.74
  5. Step 5: Solve for x
    x = 2,503,509,046.74/80,662.96
  6. Step 6: Final answer
    x = 31,036.66

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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.