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Finding the Fourth Proportional to 11,379, 17,071.38 and 3,171

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Solution

The fourth proportional to 11,379, 17,071.38 and 3,171 is: 4,757.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,379 : 17,071.38 = 3,171 : x
  2. Step 2: Convert to fraction form
    11,379/17,071.38 = 3,171/x
  3. Step 3: Cross multiply
    11,379x = 17,071.38 × 3,171
  4. Step 4: Simplify right side
    11,379x = 54,133,345.98
  5. Step 5: Solve for x
    x = 54,133,345.98/11,379
  6. Step 6: Final answer
    x = 4,757.30

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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.