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Finding the Fourth Proportional to 3,791.78, 5,687.64 and 1,159.28

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Solution

The fourth proportional to 3,791.78, 5,687.64 and 1,159.28 is: 1,738.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,791.78 : 5,687.64 = 1,159.28 : x
  2. Step 2: Convert to fraction form
    3,791.78/5,687.64 = 1,159.28/x
  3. Step 3: Cross multiply
    3,791.78x = 5,687.64 × 1,159.28
  4. Step 4: Simplify right side
    3,791.78x = 6,593,567.30
  5. Step 5: Solve for x
    x = 6,593,567.30/3,791.78
  6. Step 6: Final answer
    x = 1,738.91

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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.