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Finding the Fourth Proportional to 71,721.48, 98,979.30 and 39,891

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Solution

The fourth proportional to 71,721.48, 98,979.30 and 39,891 is: 55,051.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,721.48 : 98,979.30 = 39,891 : x
  2. Step 2: Convert to fraction form
    71,721.48/98,979.30 = 39,891/x
  3. Step 3: Cross multiply
    71,721.48x = 98,979.30 × 39,891
  4. Step 4: Simplify right side
    71,721.48x = 3,948,383,256.30
  5. Step 5: Solve for x
    x = 3,948,383,256.30/71,721.48
  6. Step 6: Final answer
    x = 55,051.61

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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.