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Finding the Fourth Proportional to 92,789.86, 139,138.20 and 45,408.50

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Solution

The fourth proportional to 92,789.86, 139,138.20 and 45,408.50 is: 68,089.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,789.86 : 139,138.20 = 45,408.50 : x
  2. Step 2: Convert to fraction form
    92,789.86/139,138.20 = 45,408.50/x
  3. Step 3: Cross multiply
    92,789.86x = 139,138.20 × 45,408.50
  4. Step 4: Simplify right side
    92,789.86x = 6,318,056,954.70
  5. Step 5: Solve for x
    x = 6,318,056,954.70/92,789.86
  6. Step 6: Final answer
    x = 68,089.95

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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.