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Finding the Fourth Proportional to 3,991.10, 5,990.85 and 1,912.86

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Solution

The fourth proportional to 3,991.10, 5,990.85 and 1,912.86 is: 2,871.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,991.10 : 5,990.85 = 1,912.86 : x
  2. Step 2: Convert to fraction form
    3,991.10/5,990.85 = 1,912.86/x
  3. Step 3: Cross multiply
    3,991.10x = 5,990.85 × 1,912.86
  4. Step 4: Simplify right side
    3,991.10x = 11,459,657.33
  5. Step 5: Solve for x
    x = 11,459,657.33/3,991.10
  6. Step 6: Final answer
    x = 2,871.31

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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.