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Finding the Fourth Proportional to 396.59, 545.66 and 387.37

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Solution

The fourth proportional to 396.59, 545.66 and 387.37 is: 532.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.59 : 545.66 = 387.37 : x
  2. Step 2: Convert to fraction form
    396.59/545.66 = 387.37/x
  3. Step 3: Cross multiply
    396.59x = 545.66 × 387.37
  4. Step 4: Simplify right side
    396.59x = 211,372.31
  5. Step 5: Solve for x
    x = 211,372.31/396.59
  6. Step 6: Final answer
    x = 532.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.