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Finding the Fourth Proportional to 3,978.19, 5,489.90 and 2,209.96

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Solution

The fourth proportional to 3,978.19, 5,489.90 and 2,209.96 is: 3,049.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978.19 : 5,489.90 = 2,209.96 : x
  2. Step 2: Convert to fraction form
    3,978.19/5,489.90 = 2,209.96/x
  3. Step 3: Cross multiply
    3,978.19x = 5,489.90 × 2,209.96
  4. Step 4: Simplify right side
    3,978.19x = 12,132,459.40
  5. Step 5: Solve for x
    x = 12,132,459.40/3,978.19
  6. Step 6: Final answer
    x = 3,049.74

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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.