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Finding the Fourth Proportional to 408.66, 611.92 and 278.35

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Solution

The fourth proportional to 408.66, 611.92 and 278.35 is: 416.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.66 : 611.92 = 278.35 : x
  2. Step 2: Convert to fraction form
    408.66/611.92 = 278.35/x
  3. Step 3: Cross multiply
    408.66x = 611.92 × 278.35
  4. Step 4: Simplify right side
    408.66x = 170,326.75
  5. Step 5: Solve for x
    x = 170,326.75/408.66
  6. Step 6: Final answer
    x = 416.80

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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.