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Finding the Fourth Proportional to 39,960, 59,940 and 15,005.79

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Solution

The fourth proportional to 39,960, 59,940 and 15,005.79 is: 22,508.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,960 : 59,940 = 15,005.79 : x
  2. Step 2: Convert to fraction form
    39,960/59,940 = 15,005.79/x
  3. Step 3: Cross multiply
    39,960x = 59,940 × 15,005.79
  4. Step 4: Simplify right side
    39,960x = 899,447,052.60
  5. Step 5: Solve for x
    x = 899,447,052.60/39,960
  6. Step 6: Final answer
    x = 22,508.69

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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.