Home / 381,135.24-571,789.12-128,408.86

Finding the Fourth Proportional to 381,135.24, 571,789.12 and 128,408.86

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Solution

The fourth proportional to 381,135.24, 571,789.12 and 128,408.86 is: 192,642.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,135.24 : 571,789.12 = 128,408.86 : x
  2. Step 2: Convert to fraction form
    381,135.24/571,789.12 = 128,408.86/x
  3. Step 3: Cross multiply
    381,135.24x = 571,789.12 × 128,408.86
  4. Step 4: Simplify right side
    381,135.24x = 73,422,790,882.79
  5. Step 5: Solve for x
    x = 73,422,790,882.79/381,135.24
  6. Step 6: Final answer
    x = 192,642.36

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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.