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Finding the Fourth Proportional to 2,081.87, 3,121.63 and 911.69

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Solution

The fourth proportional to 2,081.87, 3,121.63 and 911.69 is: 1,367.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,081.87 : 3,121.63 = 911.69 : x
  2. Step 2: Convert to fraction form
    2,081.87/3,121.63 = 911.69/x
  3. Step 3: Cross multiply
    2,081.87x = 3,121.63 × 911.69
  4. Step 4: Simplify right side
    2,081.87x = 2,845,958.85
  5. Step 5: Solve for x
    x = 2,845,958.85/2,081.87
  6. Step 6: Final answer
    x = 1,367.02

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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.