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Finding the Fourth Proportional to 18,661, 27,991.74 and 6,349

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Solution

The fourth proportional to 18,661, 27,991.74 and 6,349 is: 9,523.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,661 : 27,991.74 = 6,349 : x
  2. Step 2: Convert to fraction form
    18,661/27,991.74 = 6,349/x
  3. Step 3: Cross multiply
    18,661x = 27,991.74 × 6,349
  4. Step 4: Simplify right side
    18,661x = 177,719,557.26
  5. Step 5: Solve for x
    x = 177,719,557.26/18,661
  6. Step 6: Final answer
    x = 9,523.58

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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.