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Finding the Fourth Proportional to 18,769.86, 28,135.18 and 6,279.61

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Solution

The fourth proportional to 18,769.86, 28,135.18 and 6,279.61 is: 9,412.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,769.86 : 28,135.18 = 6,279.61 : x
  2. Step 2: Convert to fraction form
    18,769.86/28,135.18 = 6,279.61/x
  3. Step 3: Cross multiply
    18,769.86x = 28,135.18 × 6,279.61
  4. Step 4: Simplify right side
    18,769.86x = 176,677,912.62
  5. Step 5: Solve for x
    x = 176,677,912.62/18,769.86
  6. Step 6: Final answer
    x = 9,412.85

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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.