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Finding the Fourth Proportional to 81,390.96, 122,098.68 and 28,800.96

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Solution

The fourth proportional to 81,390.96, 122,098.68 and 28,800.96 is: 43,205.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,390.96 : 122,098.68 = 28,800.96 : x
  2. Step 2: Convert to fraction form
    81,390.96/122,098.68 = 28,800.96/x
  3. Step 3: Cross multiply
    81,390.96x = 122,098.68 × 28,800.96
  4. Step 4: Simplify right side
    81,390.96x = 3,516,559,198.73
  5. Step 5: Solve for x
    x = 3,516,559,198.73/81,390.96
  6. Step 6: Final answer
    x = 43,205.77

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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.