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Finding the Fourth Proportional to 619.08, 853.38 and 487.86

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Solution

The fourth proportional to 619.08, 853.38 and 487.86 is: 672.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.08 : 853.38 = 487.86 : x
  2. Step 2: Convert to fraction form
    619.08/853.38 = 487.86/x
  3. Step 3: Cross multiply
    619.08x = 853.38 × 487.86
  4. Step 4: Simplify right side
    619.08x = 416,329.97
  5. Step 5: Solve for x
    x = 416,329.97/619.08
  6. Step 6: Final answer
    x = 672.50

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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.