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Finding the Fourth Proportional to 391,578.24, 587,394.88 and 121,670

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Solution

The fourth proportional to 391,578.24, 587,394.88 and 121,670 is: 182,513.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,578.24 : 587,394.88 = 121,670 : x
  2. Step 2: Convert to fraction form
    391,578.24/587,394.88 = 121,670/x
  3. Step 3: Cross multiply
    391,578.24x = 587,394.88 × 121,670
  4. Step 4: Simplify right side
    391,578.24x = 71,468,335,049.60
  5. Step 5: Solve for x
    x = 71,468,335,049.60/391,578.24
  6. Step 6: Final answer
    x = 182,513.55

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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.