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Finding the Fourth Proportional to 15,691, 21,655.50 and 9,067

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Solution

The fourth proportional to 15,691, 21,655.50 and 9,067 is: 12,513.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,691 : 21,655.50 = 9,067 : x
  2. Step 2: Convert to fraction form
    15,691/21,655.50 = 9,067/x
  3. Step 3: Cross multiply
    15,691x = 21,655.50 × 9,067
  4. Step 4: Simplify right side
    15,691x = 196,350,418.50
  5. Step 5: Solve for x
    x = 196,350,418.50/15,691
  6. Step 6: Final answer
    x = 12,513.57

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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.