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Finding the Fourth Proportional to 408,839.20, 613,258.80 and 109,319.20

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Solution

The fourth proportional to 408,839.20, 613,258.80 and 109,319.20 is: 163,978.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,839.20 : 613,258.80 = 109,319.20 : x
  2. Step 2: Convert to fraction form
    408,839.20/613,258.80 = 109,319.20/x
  3. Step 3: Cross multiply
    408,839.20x = 613,258.80 × 109,319.20
  4. Step 4: Simplify right side
    408,839.20x = 67,040,961,408.96
  5. Step 5: Solve for x
    x = 67,040,961,408.96/408,839.20
  6. Step 6: Final answer
    x = 163,978.80

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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.