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Finding the Fourth Proportional to 579.39, 868.21 and 425.09

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Solution

The fourth proportional to 579.39, 868.21 and 425.09 is: 636.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.39 : 868.21 = 425.09 : x
  2. Step 2: Convert to fraction form
    579.39/868.21 = 425.09/x
  3. Step 3: Cross multiply
    579.39x = 868.21 × 425.09
  4. Step 4: Simplify right side
    579.39x = 369,060.92
  5. Step 5: Solve for x
    x = 369,060.92/579.39
  6. Step 6: Final answer
    x = 636.98

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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.