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Finding the Fourth Proportional to 11,929, 17,893.50 and 3,721

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Solution

The fourth proportional to 11,929, 17,893.50 and 3,721 is: 5,581.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,929 : 17,893.50 = 3,721 : x
  2. Step 2: Convert to fraction form
    11,929/17,893.50 = 3,721/x
  3. Step 3: Cross multiply
    11,929x = 17,893.50 × 3,721
  4. Step 4: Simplify right side
    11,929x = 66,581,713.50
  5. Step 5: Solve for x
    x = 66,581,713.50/11,929
  6. Step 6: Final answer
    x = 5,581.50

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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.