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Finding the Fourth Proportional to 18,691, 28,040.96 and 6,379

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Solution

The fourth proportional to 18,691, 28,040.96 and 6,379 is: 9,570.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691 : 28,040.96 = 6,379 : x
  2. Step 2: Convert to fraction form
    18,691/28,040.96 = 6,379/x
  3. Step 3: Cross multiply
    18,691x = 28,040.96 × 6,379
  4. Step 4: Simplify right side
    18,691x = 178,873,283.84
  5. Step 5: Solve for x
    x = 178,873,283.84/18,691
  6. Step 6: Final answer
    x = 9,570.02

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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.