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Finding the Fourth Proportional to 665.11, 997.25 and 318.44

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Solution

The fourth proportional to 665.11, 997.25 and 318.44 is: 477.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.11 : 997.25 = 318.44 : x
  2. Step 2: Convert to fraction form
    665.11/997.25 = 318.44/x
  3. Step 3: Cross multiply
    665.11x = 997.25 × 318.44
  4. Step 4: Simplify right side
    665.11x = 317,562.39
  5. Step 5: Solve for x
    x = 317,562.39/665.11
  6. Step 6: Final answer
    x = 477.46

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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.