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Finding the Fourth Proportional to 381,013.20, 571,119.72 and 128,205.93

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Solution

The fourth proportional to 381,013.20, 571,119.72 and 128,205.93 is: 192,174.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,013.20 : 571,119.72 = 128,205.93 : x
  2. Step 2: Convert to fraction form
    381,013.20/571,119.72 = 128,205.93/x
  3. Step 3: Cross multiply
    381,013.20x = 571,119.72 × 128,205.93
  4. Step 4: Simplify right side
    381,013.20x = 73,220,934,843.94
  5. Step 5: Solve for x
    x = 73,220,934,843.94/381,013.20
  6. Step 6: Final answer
    x = 192,174.27

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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.