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Finding the Fourth Proportional to 11,879.49, 17,819.25 and 3,980.55

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Solution

The fourth proportional to 11,879.49, 17,819.25 and 3,980.55 is: 5,970.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,879.49 : 17,819.25 = 3,980.55 : x
  2. Step 2: Convert to fraction form
    11,879.49/17,819.25 = 3,980.55/x
  3. Step 3: Cross multiply
    11,879.49x = 17,819.25 × 3,980.55
  4. Step 4: Simplify right side
    11,879.49x = 70,930,415.59
  5. Step 5: Solve for x
    x = 70,930,415.59/11,879.49
  6. Step 6: Final answer
    x = 5,970.83

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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.