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Finding the Fourth Proportional to 21,104, 29,121 and 11,671.28

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Solution

The fourth proportional to 21,104, 29,121 and 11,671.28 is: 16,104.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,104 : 29,121 = 11,671.28 : x
  2. Step 2: Convert to fraction form
    21,104/29,121 = 11,671.28/x
  3. Step 3: Cross multiply
    21,104x = 29,121 × 11,671.28
  4. Step 4: Simplify right side
    21,104x = 339,879,344.88
  5. Step 5: Solve for x
    x = 339,879,344.88/21,104
  6. Step 6: Final answer
    x = 16,104.97

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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.