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Finding the Fourth Proportional to 664.69, 997.15 and 253.86

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Solution

The fourth proportional to 664.69, 997.15 and 253.86 is: 380.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.69 : 997.15 = 253.86 : x
  2. Step 2: Convert to fraction form
    664.69/997.15 = 253.86/x
  3. Step 3: Cross multiply
    664.69x = 997.15 × 253.86
  4. Step 4: Simplify right side
    664.69x = 253,136.50
  5. Step 5: Solve for x
    x = 253,136.50/664.69
  6. Step 6: Final answer
    x = 380.83

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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.