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Finding the Fourth Proportional to 80,607.22, 120,921.76 and 28,009.87

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Solution

The fourth proportional to 80,607.22, 120,921.76 and 28,009.87 is: 42,018.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,607.22 : 120,921.76 = 28,009.87 : x
  2. Step 2: Convert to fraction form
    80,607.22/120,921.76 = 28,009.87/x
  3. Step 3: Cross multiply
    80,607.22x = 120,921.76 × 28,009.87
  4. Step 4: Simplify right side
    80,607.22x = 3,387,002,510.48
  5. Step 5: Solve for x
    x = 3,387,002,510.48/80,607.22
  6. Step 6: Final answer
    x = 42,018.60

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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.