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Finding the Fourth Proportional to 15,791.69, 21,792.11 and 8,717.96

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Solution

The fourth proportional to 15,791.69, 21,792.11 and 8,717.96 is: 12,030.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,791.69 : 21,792.11 = 8,717.96 : x
  2. Step 2: Convert to fraction form
    15,791.69/21,792.11 = 8,717.96/x
  3. Step 3: Cross multiply
    15,791.69x = 21,792.11 × 8,717.96
  4. Step 4: Simplify right side
    15,791.69x = 189,982,590.75
  5. Step 5: Solve for x
    x = 189,982,590.75/15,791.69
  6. Step 6: Final answer
    x = 12,030.55

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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.