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Finding the Fourth Proportional to 397.20, 595.80 and 137.28

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Solution

The fourth proportional to 397.20, 595.80 and 137.28 is: 205.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.20 : 595.80 = 137.28 : x
  2. Step 2: Convert to fraction form
    397.20/595.80 = 137.28/x
  3. Step 3: Cross multiply
    397.20x = 595.80 × 137.28
  4. Step 4: Simplify right side
    397.20x = 81,791.42
  5. Step 5: Solve for x
    x = 81,791.42/397.20
  6. Step 6: Final answer
    x = 205.92

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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.