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Finding the Fourth Proportional to 619.20, 854.10 and 422.64

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Solution

The fourth proportional to 619.20, 854.10 and 422.64 is: 582.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.20 : 854.10 = 422.64 : x
  2. Step 2: Convert to fraction form
    619.20/854.10 = 422.64/x
  3. Step 3: Cross multiply
    619.20x = 854.10 × 422.64
  4. Step 4: Simplify right side
    619.20x = 360,976.82
  5. Step 5: Solve for x
    x = 360,976.82/619.20
  6. Step 6: Final answer
    x = 582.97

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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.