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Finding the Fourth Proportional to 581.30, 871.14 and 321.42

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Solution

The fourth proportional to 581.30, 871.14 and 321.42 is: 481.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.30 : 871.14 = 321.42 : x
  2. Step 2: Convert to fraction form
    581.30/871.14 = 321.42/x
  3. Step 3: Cross multiply
    581.30x = 871.14 × 321.42
  4. Step 4: Simplify right side
    581.30x = 280,001.82
  5. Step 5: Solve for x
    x = 280,001.82/581.30
  6. Step 6: Final answer
    x = 481.68

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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.