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Finding the Fourth Proportional to 21,375.54, 29,495.61 and 11,943.90

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Solution

The fourth proportional to 21,375.54, 29,495.61 and 11,943.90 is: 16,481.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,375.54 : 29,495.61 = 11,943.90 : x
  2. Step 2: Convert to fraction form
    21,375.54/29,495.61 = 11,943.90/x
  3. Step 3: Cross multiply
    21,375.54x = 29,495.61 × 11,943.90
  4. Step 4: Simplify right side
    21,375.54x = 352,292,616.28
  5. Step 5: Solve for x
    x = 352,292,616.28/21,375.54
  6. Step 6: Final answer
    x = 16,481.11

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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.