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Finding the Fourth Proportional to 9,921, 14,887.28 and 4,449

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Solution

The fourth proportional to 9,921, 14,887.28 and 4,449 is: 6,676.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,921 : 14,887.28 = 4,449 : x
  2. Step 2: Convert to fraction form
    9,921/14,887.28 = 4,449/x
  3. Step 3: Cross multiply
    9,921x = 14,887.28 × 4,449
  4. Step 4: Simplify right side
    9,921x = 66,233,508.72
  5. Step 5: Solve for x
    x = 66,233,508.72/9,921
  6. Step 6: Final answer
    x = 6,676.09

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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.