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Finding the Fourth Proportional to 13,920.88, 20,879.10 and 4,057.85

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Solution

The fourth proportional to 13,920.88, 20,879.10 and 4,057.85 is: 6,086.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,920.88 : 20,879.10 = 4,057.85 : x
  2. Step 2: Convert to fraction form
    13,920.88/20,879.10 = 4,057.85/x
  3. Step 3: Cross multiply
    13,920.88x = 20,879.10 × 4,057.85
  4. Step 4: Simplify right side
    13,920.88x = 84,724,308.13
  5. Step 5: Solve for x
    x = 84,724,308.13/13,920.88
  6. Step 6: Final answer
    x = 6,086.13

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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.