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Finding the Fourth Proportional to 391,986.39, 587,924.23 and 125,712.31

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Solution

The fourth proportional to 391,986.39, 587,924.23 and 125,712.31 is: 188,550.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,986.39 : 587,924.23 = 125,712.31 : x
  2. Step 2: Convert to fraction form
    391,986.39/587,924.23 = 125,712.31/x
  3. Step 3: Cross multiply
    391,986.39x = 587,924.23 × 125,712.31
  4. Step 4: Simplify right side
    391,986.39x = 73,909,313,058.27
  5. Step 5: Solve for x
    x = 73,909,313,058.27/391,986.39
  6. Step 6: Final answer
    x = 188,550.71

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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.