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Finding the Fourth Proportional to 396.81, 594.77 and 213.80

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Solution

The fourth proportional to 396.81, 594.77 and 213.80 is: 320.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.81 : 594.77 = 213.80 : x
  2. Step 2: Convert to fraction form
    396.81/594.77 = 213.80/x
  3. Step 3: Cross multiply
    396.81x = 594.77 × 213.80
  4. Step 4: Simplify right side
    396.81x = 127,157.78
  5. Step 5: Solve for x
    x = 127,157.78/396.81
  6. Step 6: Final answer
    x = 320.45

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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.