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Finding the Fourth Proportional to 664.27, 996.68 and 390.49

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Solution

The fourth proportional to 664.27, 996.68 and 390.49 is: 585.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.27 : 996.68 = 390.49 : x
  2. Step 2: Convert to fraction form
    664.27/996.68 = 390.49/x
  3. Step 3: Cross multiply
    664.27x = 996.68 × 390.49
  4. Step 4: Simplify right side
    664.27x = 389,193.57
  5. Step 5: Solve for x
    x = 389,193.57/664.27
  6. Step 6: Final answer
    x = 585.90

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Double scale
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Similar ratio
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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.