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Finding the Fourth Proportional to 381,429.52, 571,915.77 and 128,704.39

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Solution

The fourth proportional to 381,429.52, 571,915.77 and 128,704.39 is: 192,979.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,429.52 : 571,915.77 = 128,704.39 : x
  2. Step 2: Convert to fraction form
    381,429.52/571,915.77 = 128,704.39/x
  3. Step 3: Cross multiply
    381,429.52x = 571,915.77 × 128,704.39
  4. Step 4: Simplify right side
    381,429.52x = 73,608,070,309.23
  5. Step 5: Solve for x
    x = 73,608,070,309.23/381,429.52
  6. Step 6: Final answer
    x = 192,979.48

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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.