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Finding the Fourth Proportional to 396.80, 595.21 and 136.81

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Solution

The fourth proportional to 396.80, 595.21 and 136.81 is: 205.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.80 : 595.21 = 136.81 : x
  2. Step 2: Convert to fraction form
    396.80/595.21 = 136.81/x
  3. Step 3: Cross multiply
    396.80x = 595.21 × 136.81
  4. Step 4: Simplify right side
    396.80x = 81,430.68
  5. Step 5: Solve for x
    x = 81,430.68/396.80
  6. Step 6: Final answer
    x = 205.22

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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.