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Finding the Fourth Proportional to 665.20, 997.87 and 254.68

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Solution

The fourth proportional to 665.20, 997.87 and 254.68 is: 382.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.20 : 997.87 = 254.68 : x
  2. Step 2: Convert to fraction form
    665.20/997.87 = 254.68/x
  3. Step 3: Cross multiply
    665.20x = 997.87 × 254.68
  4. Step 4: Simplify right side
    665.20x = 254,136.26
  5. Step 5: Solve for x
    x = 254,136.26/665.20
  6. Step 6: Final answer
    x = 382.05

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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.