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Finding the Fourth Proportional to 3,978.14, 5,489.88 and 2,161.16

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Solution

The fourth proportional to 3,978.14, 5,489.88 and 2,161.16 is: 2,982.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978.14 : 5,489.88 = 2,161.16 : x
  2. Step 2: Convert to fraction form
    3,978.14/5,489.88 = 2,161.16/x
  3. Step 3: Cross multiply
    3,978.14x = 5,489.88 × 2,161.16
  4. Step 4: Simplify right side
    3,978.14x = 11,864,481.61
  5. Step 5: Solve for x
    x = 11,864,481.61/3,978.14
  6. Step 6: Final answer
    x = 2,982.42

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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.