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Finding the Fourth Proportional to 664.75, 997.82 and 318.37

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Solution

The fourth proportional to 664.75, 997.82 and 318.37 is: 477.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.75 : 997.82 = 318.37 : x
  2. Step 2: Convert to fraction form
    664.75/997.82 = 318.37/x
  3. Step 3: Cross multiply
    664.75x = 997.82 × 318.37
  4. Step 4: Simplify right side
    664.75x = 317,674.36
  5. Step 5: Solve for x
    x = 317,674.36/664.75
  6. Step 6: Final answer
    x = 477.89

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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.