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Finding the Fourth Proportional to 396.33, 545.80 and 387.85

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Solution

The fourth proportional to 396.33, 545.80 and 387.85 is: 534.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.33 : 545.80 = 387.85 : x
  2. Step 2: Convert to fraction form
    396.33/545.80 = 387.85/x
  3. Step 3: Cross multiply
    396.33x = 545.80 × 387.85
  4. Step 4: Simplify right side
    396.33x = 211,686.77
  5. Step 5: Solve for x
    x = 211,686.77/396.33
  6. Step 6: Final answer
    x = 534.12

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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.