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Finding the Fourth Proportional to 408.72, 611.87 and 254.15

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Solution

The fourth proportional to 408.72, 611.87 and 254.15 is: 380.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.72 : 611.87 = 254.15 : x
  2. Step 2: Convert to fraction form
    408.72/611.87 = 254.15/x
  3. Step 3: Cross multiply
    408.72x = 611.87 × 254.15
  4. Step 4: Simplify right side
    408.72x = 155,506.76
  5. Step 5: Solve for x
    x = 155,506.76/408.72
  6. Step 6: Final answer
    x = 380.47

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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.