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Finding the Fourth Proportional to 8,679.69, 13,019.49 and 2,105.91

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Solution

The fourth proportional to 8,679.69, 13,019.49 and 2,105.91 is: 3,158.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.69 : 13,019.49 = 2,105.91 : x
  2. Step 2: Convert to fraction form
    8,679.69/13,019.49 = 2,105.91/x
  3. Step 3: Cross multiply
    8,679.69x = 13,019.49 × 2,105.91
  4. Step 4: Simplify right side
    8,679.69x = 27,417,874.19
  5. Step 5: Solve for x
    x = 27,417,874.19/8,679.69
  6. Step 6: Final answer
    x = 3,158.85

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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.