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Finding the Fourth Proportional to 579.43, 868.12 and 405.73

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Solution

The fourth proportional to 579.43, 868.12 and 405.73 is: 607.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.43 : 868.12 = 405.73 : x
  2. Step 2: Convert to fraction form
    579.43/868.12 = 405.73/x
  3. Step 3: Cross multiply
    579.43x = 868.12 × 405.73
  4. Step 4: Simplify right side
    579.43x = 352,222.33
  5. Step 5: Solve for x
    x = 352,222.33/579.43
  6. Step 6: Final answer
    x = 607.88

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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.