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Finding the Fourth Proportional to 664.76, 997.11 and 254.09

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Solution

The fourth proportional to 664.76, 997.11 and 254.09 is: 381.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.76 : 997.11 = 254.09 : x
  2. Step 2: Convert to fraction form
    664.76/997.11 = 254.09/x
  3. Step 3: Cross multiply
    664.76x = 997.11 × 254.09
  4. Step 4: Simplify right side
    664.76x = 253,355.68
  5. Step 5: Solve for x
    x = 253,355.68/664.76
  6. Step 6: Final answer
    x = 381.12

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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.