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Finding the Fourth Proportional to 408.87, 613.61 and 165.39

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Solution

The fourth proportional to 408.87, 613.61 and 165.39 is: 248.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.87 : 613.61 = 165.39 : x
  2. Step 2: Convert to fraction form
    408.87/613.61 = 165.39/x
  3. Step 3: Cross multiply
    408.87x = 613.61 × 165.39
  4. Step 4: Simplify right side
    408.87x = 101,484.13
  5. Step 5: Solve for x
    x = 101,484.13/408.87
  6. Step 6: Final answer
    x = 248.21

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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.