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Finding the Fourth Proportional to 2,188.39, 3,279.15 and 871.43

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Solution

The fourth proportional to 2,188.39, 3,279.15 and 871.43 is: 1,305.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,188.39 : 3,279.15 = 871.43 : x
  2. Step 2: Convert to fraction form
    2,188.39/3,279.15 = 871.43/x
  3. Step 3: Cross multiply
    2,188.39x = 3,279.15 × 871.43
  4. Step 4: Simplify right side
    2,188.39x = 2,857,549.68
  5. Step 5: Solve for x
    x = 2,857,549.68/2,188.39
  6. Step 6: Final answer
    x = 1,305.78

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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.