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Finding the Fourth Proportional to 619.11, 853.98 and 397.68

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Solution

The fourth proportional to 619.11, 853.98 and 397.68 is: 548.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.11 : 853.98 = 397.68 : x
  2. Step 2: Convert to fraction form
    619.11/853.98 = 397.68/x
  3. Step 3: Cross multiply
    619.11x = 853.98 × 397.68
  4. Step 4: Simplify right side
    619.11x = 339,610.77
  5. Step 5: Solve for x
    x = 339,610.77/619.11
  6. Step 6: Final answer
    x = 548.55

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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.