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Finding the Fourth Proportional to 579.32, 869.38 and 396.88

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Solution

The fourth proportional to 579.32, 869.38 and 396.88 is: 595.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.32 : 869.38 = 396.88 : x
  2. Step 2: Convert to fraction form
    579.32/869.38 = 396.88/x
  3. Step 3: Cross multiply
    579.32x = 869.38 × 396.88
  4. Step 4: Simplify right side
    579.32x = 345,039.53
  5. Step 5: Solve for x
    x = 345,039.53/579.32
  6. Step 6: Final answer
    x = 595.59

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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.