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Finding the Fourth Proportional to 20,553, 28,363.14 and 11,721

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Solution

The fourth proportional to 20,553, 28,363.14 and 11,721 is: 16,174.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,553 : 28,363.14 = 11,721 : x
  2. Step 2: Convert to fraction form
    20,553/28,363.14 = 11,721/x
  3. Step 3: Cross multiply
    20,553x = 28,363.14 × 11,721
  4. Step 4: Simplify right side
    20,553x = 332,444,363.94
  5. Step 5: Solve for x
    x = 332,444,363.94/20,553
  6. Step 6: Final answer
    x = 16,174.98

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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.