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Finding the Fourth Proportional to 3,991.22, 5,987.13 and 1,217.91

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Solution

The fourth proportional to 3,991.22, 5,987.13 and 1,217.91 is: 1,826.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,991.22 : 5,987.13 = 1,217.91 : x
  2. Step 2: Convert to fraction form
    3,991.22/5,987.13 = 1,217.91/x
  3. Step 3: Cross multiply
    3,991.22x = 5,987.13 × 1,217.91
  4. Step 4: Simplify right side
    3,991.22x = 7,291,796.82
  5. Step 5: Solve for x
    x = 7,291,796.82/3,991.22
  6. Step 6: Final answer
    x = 1,826.96

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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.