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Finding the Fourth Proportional to 396.88, 595.60 and 393.68

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Solution

The fourth proportional to 396.88, 595.60 and 393.68 is: 590.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.88 : 595.60 = 393.68 : x
  2. Step 2: Convert to fraction form
    396.88/595.60 = 393.68/x
  3. Step 3: Cross multiply
    396.88x = 595.60 × 393.68
  4. Step 4: Simplify right side
    396.88x = 234,475.81
  5. Step 5: Solve for x
    x = 234,475.81/396.88
  6. Step 6: Final answer
    x = 590.80

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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.