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Finding the Fourth Proportional to 20,388.69, 30,591.54 and 7,917.39

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Solution

The fourth proportional to 20,388.69, 30,591.54 and 7,917.39 is: 11,879.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.69 : 30,591.54 = 7,917.39 : x
  2. Step 2: Convert to fraction form
    20,388.69/30,591.54 = 7,917.39/x
  3. Step 3: Cross multiply
    20,388.69x = 30,591.54 × 7,917.39
  4. Step 4: Simplify right side
    20,388.69x = 242,205,152.88
  5. Step 5: Solve for x
    x = 242,205,152.88/20,388.69
  6. Step 6: Final answer
    x = 11,879.39

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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.