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Finding the Fourth Proportional to 618.59, 853.92 and 408.86

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Solution

The fourth proportional to 618.59, 853.92 and 408.86 is: 564.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.59 : 853.92 = 408.86 : x
  2. Step 2: Convert to fraction form
    618.59/853.92 = 408.86/x
  3. Step 3: Cross multiply
    618.59x = 853.92 × 408.86
  4. Step 4: Simplify right side
    618.59x = 349,133.73
  5. Step 5: Solve for x
    x = 349,133.73/618.59
  6. Step 6: Final answer
    x = 564.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.