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Finding the Fourth Proportional to 579.06, 868.56 and 213.78

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Solution

The fourth proportional to 579.06, 868.56 and 213.78 is: 320.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.06 : 868.56 = 213.78 : x
  2. Step 2: Convert to fraction form
    579.06/868.56 = 213.78/x
  3. Step 3: Cross multiply
    579.06x = 868.56 × 213.78
  4. Step 4: Simplify right side
    579.06x = 185,680.76
  5. Step 5: Solve for x
    x = 185,680.76/579.06
  6. Step 6: Final answer
    x = 320.66

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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.