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Finding the Fourth Proportional to 391,605.60, 587,408.40 and 125,374.80

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Solution

The fourth proportional to 391,605.60, 587,408.40 and 125,374.80 is: 188,062.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,605.60 : 587,408.40 = 125,374.80 : x
  2. Step 2: Convert to fraction form
    391,605.60/587,408.40 = 125,374.80/x
  3. Step 3: Cross multiply
    391,605.60x = 587,408.40 × 125,374.80
  4. Step 4: Simplify right side
    391,605.60x = 73,646,210,668.32
  5. Step 5: Solve for x
    x = 73,646,210,668.32/391,605.60
  6. Step 6: Final answer
    x = 188,062.20

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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.