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Finding the Fourth Proportional to 664.40, 997.08 and 231.92

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Solution

The fourth proportional to 664.40, 997.08 and 231.92 is: 348.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.40 : 997.08 = 231.92 : x
  2. Step 2: Convert to fraction form
    664.40/997.08 = 231.92/x
  3. Step 3: Cross multiply
    664.40x = 997.08 × 231.92
  4. Step 4: Simplify right side
    664.40x = 231,242.79
  5. Step 5: Solve for x
    x = 231,242.79/664.40
  6. Step 6: Final answer
    x = 348.05

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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.