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Finding the Fourth Proportional to 579.31, 868.93 and 213.93

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Solution

The fourth proportional to 579.31, 868.93 and 213.93 is: 320.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.31 : 868.93 = 213.93 : x
  2. Step 2: Convert to fraction form
    579.31/868.93 = 213.93/x
  3. Step 3: Cross multiply
    579.31x = 868.93 × 213.93
  4. Step 4: Simplify right side
    579.31x = 185,889.66
  5. Step 5: Solve for x
    x = 185,889.66/579.31
  6. Step 6: Final answer
    x = 320.88

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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.