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Finding the Fourth Proportional to 11,879.13, 17,815.65 and 4,481.40

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Solution

The fourth proportional to 11,879.13, 17,815.65 and 4,481.40 is: 6,720.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,879.13 : 17,815.65 = 4,481.40 : x
  2. Step 2: Convert to fraction form
    11,879.13/17,815.65 = 4,481.40/x
  3. Step 3: Cross multiply
    11,879.13x = 17,815.65 × 4,481.40
  4. Step 4: Simplify right side
    11,879.13x = 79,839,053.91
  5. Step 5: Solve for x
    x = 79,839,053.91/11,879.13
  6. Step 6: Final answer
    x = 6,720.95

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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.