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Finding the Fourth Proportional to 664.62, 997.09 and 279.90

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Solution

The fourth proportional to 664.62, 997.09 and 279.90 is: 419.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.62 : 997.09 = 279.90 : x
  2. Step 2: Convert to fraction form
    664.62/997.09 = 279.90/x
  3. Step 3: Cross multiply
    664.62x = 997.09 × 279.90
  4. Step 4: Simplify right side
    664.62x = 279,085.49
  5. Step 5: Solve for x
    x = 279,085.49/664.62
  6. Step 6: Final answer
    x = 419.92

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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.