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Finding the Fourth Proportional to 6,987.78, 9,643.17 and 3,843.96

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Solution

The fourth proportional to 6,987.78, 9,643.17 and 3,843.96 is: 5,304.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,987.78 : 9,643.17 = 3,843.96 : x
  2. Step 2: Convert to fraction form
    6,987.78/9,643.17 = 3,843.96/x
  3. Step 3: Cross multiply
    6,987.78x = 9,643.17 × 3,843.96
  4. Step 4: Simplify right side
    6,987.78x = 37,067,959.75
  5. Step 5: Solve for x
    x = 37,067,959.75/6,987.78
  6. Step 6: Final answer
    x = 5,304.68

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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.