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Finding the Fourth Proportional to 92,856.70, 139,285.05 and 91,981.90

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Solution

The fourth proportional to 92,856.70, 139,285.05 and 91,981.90 is: 137,972.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,856.70 : 139,285.05 = 91,981.90 : x
  2. Step 2: Convert to fraction form
    92,856.70/139,285.05 = 91,981.90/x
  3. Step 3: Cross multiply
    92,856.70x = 139,285.05 × 91,981.90
  4. Step 4: Simplify right side
    92,856.70x = 12,811,703,540.60
  5. Step 5: Solve for x
    x = 12,811,703,540.60/92,856.70
  6. Step 6: Final answer
    x = 137,972.85

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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.