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Finding the Fourth Proportional to 397.97, 596.80 and 137.90

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Solution

The fourth proportional to 397.97, 596.80 and 137.90 is: 206.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.97 : 596.80 = 137.90 : x
  2. Step 2: Convert to fraction form
    397.97/596.80 = 137.90/x
  3. Step 3: Cross multiply
    397.97x = 596.80 × 137.90
  4. Step 4: Simplify right side
    397.97x = 82,298.72
  5. Step 5: Solve for x
    x = 82,298.72/397.97
  6. Step 6: Final answer
    x = 206.80

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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.