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Finding the Fourth Proportional to 15,291, 21,101.90 and 8,667

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Solution

The fourth proportional to 15,291, 21,101.90 and 8,667 is: 11,960.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,291 : 21,101.90 = 8,667 : x
  2. Step 2: Convert to fraction form
    15,291/21,101.90 = 8,667/x
  3. Step 3: Cross multiply
    15,291x = 21,101.90 × 8,667
  4. Step 4: Simplify right side
    15,291x = 182,890,167.30
  5. Step 5: Solve for x
    x = 182,890,167.30/15,291
  6. Step 6: Final answer
    x = 11,960.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.