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Finding the Fourth Proportional to 8,379.96, 12,569.92 and 2,139.97

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Solution

The fourth proportional to 8,379.96, 12,569.92 and 2,139.97 is: 3,209.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,379.96 : 12,569.92 = 2,139.97 : x
  2. Step 2: Convert to fraction form
    8,379.96/12,569.92 = 2,139.97/x
  3. Step 3: Cross multiply
    8,379.96x = 12,569.92 × 2,139.97
  4. Step 4: Simplify right side
    8,379.96x = 26,899,251.70
  5. Step 5: Solve for x
    x = 26,899,251.70/8,379.96
  6. Step 6: Final answer
    x = 3,209.95

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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.