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Finding the Fourth Proportional to 3,991.86, 5,987.28 and 2,511.30

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Solution

The fourth proportional to 3,991.86, 5,987.28 and 2,511.30 is: 3,766.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,991.86 : 5,987.28 = 2,511.30 : x
  2. Step 2: Convert to fraction form
    3,991.86/5,987.28 = 2,511.30/x
  3. Step 3: Cross multiply
    3,991.86x = 5,987.28 × 2,511.30
  4. Step 4: Simplify right side
    3,991.86x = 15,035,856.26
  5. Step 5: Solve for x
    x = 15,035,856.26/3,991.86
  6. Step 6: Final answer
    x = 3,766.63

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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.