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Finding the Fourth Proportional to 391,285.30, 587,012.11 and 121,408.03

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Solution

The fourth proportional to 391,285.30, 587,012.11 and 121,408.03 is: 182,138.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,285.30 : 587,012.11 = 121,408.03 : x
  2. Step 2: Convert to fraction form
    391,285.30/587,012.11 = 121,408.03/x
  3. Step 3: Cross multiply
    391,285.30x = 587,012.11 × 121,408.03
  4. Step 4: Simplify right side
    391,285.30x = 71,267,984,974.41
  5. Step 5: Solve for x
    x = 71,267,984,974.41/391,285.30
  6. Step 6: Final answer
    x = 182,138.16

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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.