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Finding the Fourth Proportional to 681.87, 1,023.21 and 271.20

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Solution

The fourth proportional to 681.87, 1,023.21 and 271.20 is: 406.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.87 : 1,023.21 = 271.20 : x
  2. Step 2: Convert to fraction form
    681.87/1,023.21 = 271.20/x
  3. Step 3: Cross multiply
    681.87x = 1,023.21 × 271.20
  4. Step 4: Simplify right side
    681.87x = 277,494.55
  5. Step 5: Solve for x
    x = 277,494.55/681.87
  6. Step 6: Final answer
    x = 406.96

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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.