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Finding the Fourth Proportional to 67,279.94, 100,787.07 and 39,129.20

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Solution

The fourth proportional to 67,279.94, 100,787.07 and 39,129.20 is: 58,616.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,279.94 : 100,787.07 = 39,129.20 : x
  2. Step 2: Convert to fraction form
    67,279.94/100,787.07 = 39,129.20/x
  3. Step 3: Cross multiply
    67,279.94x = 100,787.07 × 39,129.20
  4. Step 4: Simplify right side
    67,279.94x = 3,943,717,419.44
  5. Step 5: Solve for x
    x = 3,943,717,419.44/67,279.94
  6. Step 6: Final answer
    x = 58,616.54

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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.