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Finding the Fourth Proportional to 578.85, 869.23 and 396.39

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Solution

The fourth proportional to 578.85, 869.23 and 396.39 is: 595.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.85 : 869.23 = 396.39 : x
  2. Step 2: Convert to fraction form
    578.85/869.23 = 396.39/x
  3. Step 3: Cross multiply
    578.85x = 869.23 × 396.39
  4. Step 4: Simplify right side
    578.85x = 344,557.83
  5. Step 5: Solve for x
    x = 344,557.83/578.85
  6. Step 6: Final answer
    x = 595.25

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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.