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Finding the Fourth Proportional to 12,979.92, 19,469.88 and 10,387.92

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Solution

The fourth proportional to 12,979.92, 19,469.88 and 10,387.92 is: 15,581.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,979.92 : 19,469.88 = 10,387.92 : x
  2. Step 2: Convert to fraction form
    12,979.92/19,469.88 = 10,387.92/x
  3. Step 3: Cross multiply
    12,979.92x = 19,469.88 × 10,387.92
  4. Step 4: Simplify right side
    12,979.92x = 202,251,555.85
  5. Step 5: Solve for x
    x = 202,251,555.85/12,979.92
  6. Step 6: Final answer
    x = 15,581.88

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Similar ratio
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1.5x scale

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.