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Finding the Fourth Proportional to 3,991.72, 5,987.89 and 1,218.41

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Solution

The fourth proportional to 3,991.72, 5,987.89 and 1,218.41 is: 1,827.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,991.72 : 5,987.89 = 1,218.41 : x
  2. Step 2: Convert to fraction form
    3,991.72/5,987.89 = 1,218.41/x
  3. Step 3: Cross multiply
    3,991.72x = 5,987.89 × 1,218.41
  4. Step 4: Simplify right side
    3,991.72x = 7,295,698.96
  5. Step 5: Solve for x
    x = 7,295,698.96/3,991.72
  6. Step 6: Final answer
    x = 1,827.71

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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.