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Finding the Fourth Proportional to 8,691.40, 13,039.38 and 3,759.89

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Solution

The fourth proportional to 8,691.40, 13,039.38 and 3,759.89 is: 5,640.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,691.40 : 13,039.38 = 3,759.89 : x
  2. Step 2: Convert to fraction form
    8,691.40/13,039.38 = 3,759.89/x
  3. Step 3: Cross multiply
    8,691.40x = 13,039.38 × 3,759.89
  4. Step 4: Simplify right side
    8,691.40x = 49,026,569.27
  5. Step 5: Solve for x
    x = 49,026,569.27/8,691.40
  6. Step 6: Final answer
    x = 5,640.81

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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.