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Finding the Fourth Proportional to 619.14, 853.56 and 487.92

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Solution

The fourth proportional to 619.14, 853.56 and 487.92 is: 672.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.14 : 853.56 = 487.92 : x
  2. Step 2: Convert to fraction form
    619.14/853.56 = 487.92/x
  3. Step 3: Cross multiply
    619.14x = 853.56 × 487.92
  4. Step 4: Simplify right side
    619.14x = 416,469.00
  5. Step 5: Solve for x
    x = 416,469.00/619.14
  6. Step 6: Final answer
    x = 672.66

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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.