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Finding the Fourth Proportional to 579.18, 868.08 and 213.78

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Solution

The fourth proportional to 579.18, 868.08 and 213.78 is: 320.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.18 : 868.08 = 213.78 : x
  2. Step 2: Convert to fraction form
    579.18/868.08 = 213.78/x
  3. Step 3: Cross multiply
    579.18x = 868.08 × 213.78
  4. Step 4: Simplify right side
    579.18x = 185,578.14
  5. Step 5: Solve for x
    x = 185,578.14/579.18
  6. Step 6: Final answer
    x = 320.42

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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.