Home / 8,979.87-12,391.92-5,000.78

Finding the Fourth Proportional to 8,979.87, 12,391.92 and 5,000.78

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Solution

The fourth proportional to 8,979.87, 12,391.92 and 5,000.78 is: 6,900.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.87 : 12,391.92 = 5,000.78 : x
  2. Step 2: Convert to fraction form
    8,979.87/12,391.92 = 5,000.78/x
  3. Step 3: Cross multiply
    8,979.87x = 12,391.92 × 5,000.78
  4. Step 4: Simplify right side
    8,979.87x = 61,969,296.68
  5. Step 5: Solve for x
    x = 61,969,296.68/8,979.87
  6. Step 6: Final answer
    x = 6,900.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.