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Finding the Fourth Proportional to 17,921, 26,891.22 and 8,687

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Solution

The fourth proportional to 17,921, 26,891.22 and 8,687 is: 13,035.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,921 : 26,891.22 = 8,687 : x
  2. Step 2: Convert to fraction form
    17,921/26,891.22 = 8,687/x
  3. Step 3: Cross multiply
    17,921x = 26,891.22 × 8,687
  4. Step 4: Simplify right side
    17,921x = 233,604,028.14
  5. Step 5: Solve for x
    x = 233,604,028.14/17,921
  6. Step 6: Final answer
    x = 13,035.21

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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.