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Finding the Fourth Proportional to 665.76, 997.91 and 318.81

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Solution

The fourth proportional to 665.76, 997.91 and 318.81 is: 477.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.76 : 997.91 = 318.81 : x
  2. Step 2: Convert to fraction form
    665.76/997.91 = 318.81/x
  3. Step 3: Cross multiply
    665.76x = 997.91 × 318.81
  4. Step 4: Simplify right side
    665.76x = 318,143.69
  5. Step 5: Solve for x
    x = 318,143.69/665.76
  6. Step 6: Final answer
    x = 477.87

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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.