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Finding the Fourth Proportional to 2,093.85, 3,140.81 and 861.27

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Solution

The fourth proportional to 2,093.85, 3,140.81 and 861.27 is: 1,291.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,093.85 : 3,140.81 = 861.27 : x
  2. Step 2: Convert to fraction form
    2,093.85/3,140.81 = 861.27/x
  3. Step 3: Cross multiply
    2,093.85x = 3,140.81 × 861.27
  4. Step 4: Simplify right side
    2,093.85x = 2,705,081.12
  5. Step 5: Solve for x
    x = 2,705,081.12/2,093.85
  6. Step 6: Final answer
    x = 1,291.92

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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.