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Finding the Fourth Proportional to 381,258.34, 571,488.49 and 128,451.50

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Solution

The fourth proportional to 381,258.34, 571,488.49 and 128,451.50 is: 192,542.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,258.34 : 571,488.49 = 128,451.50 : x
  2. Step 2: Convert to fraction form
    381,258.34/571,488.49 = 128,451.50/x
  3. Step 3: Cross multiply
    381,258.34x = 571,488.49 × 128,451.50
  4. Step 4: Simplify right side
    381,258.34x = 73,408,551,250.86
  5. Step 5: Solve for x
    x = 73,408,551,250.86/381,258.34
  6. Step 6: Final answer
    x = 192,542.81

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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.