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Finding the Fourth Proportional to 5,291.82, 7,936.38 and 1,781.28

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Solution

The fourth proportional to 5,291.82, 7,936.38 and 1,781.28 is: 2,671.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,291.82 : 7,936.38 = 1,781.28 : x
  2. Step 2: Convert to fraction form
    5,291.82/7,936.38 = 1,781.28/x
  3. Step 3: Cross multiply
    5,291.82x = 7,936.38 × 1,781.28
  4. Step 4: Simplify right side
    5,291.82x = 14,136,914.97
  5. Step 5: Solve for x
    x = 14,136,914.97/5,291.82
  6. Step 6: Final answer
    x = 2,671.47

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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.