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Finding the Fourth Proportional to 665.69, 996.17 and 405.61

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Solution

The fourth proportional to 665.69, 996.17 and 405.61 is: 606.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.69 : 996.17 = 405.61 : x
  2. Step 2: Convert to fraction form
    665.69/996.17 = 405.61/x
  3. Step 3: Cross multiply
    665.69x = 996.17 × 405.61
  4. Step 4: Simplify right side
    665.69x = 404,052.00
  5. Step 5: Solve for x
    x = 404,052.00/665.69
  6. Step 6: Final answer
    x = 606.97

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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.