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Finding the Fourth Proportional to 121,605.60, 182,408.40 and 84,207.90

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Solution

The fourth proportional to 121,605.60, 182,408.40 and 84,207.90 is: 126,311.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,605.60 : 182,408.40 = 84,207.90 : x
  2. Step 2: Convert to fraction form
    121,605.60/182,408.40 = 84,207.90/x
  3. Step 3: Cross multiply
    121,605.60x = 182,408.40 × 84,207.90
  4. Step 4: Simplify right side
    121,605.60x = 15,360,228,306.36
  5. Step 5: Solve for x
    x = 15,360,228,306.36/121,605.60
  6. Step 6: Final answer
    x = 126,311.85

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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.