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Finding the Fourth Proportional to 664.48, 996.96 and 390.88

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Solution

The fourth proportional to 664.48, 996.96 and 390.88 is: 586.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.48 : 996.96 = 390.88 : x
  2. Step 2: Convert to fraction form
    664.48/996.96 = 390.88/x
  3. Step 3: Cross multiply
    664.48x = 996.96 × 390.88
  4. Step 4: Simplify right side
    664.48x = 389,691.72
  5. Step 5: Solve for x
    x = 389,691.72/664.48
  6. Step 6: Final answer
    x = 586.46

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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.