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Finding the Fourth Proportional to 425.91, 639.39 and 404.39

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Solution

The fourth proportional to 425.91, 639.39 and 404.39 is: 607.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.91 : 639.39 = 404.39 : x
  2. Step 2: Convert to fraction form
    425.91/639.39 = 404.39/x
  3. Step 3: Cross multiply
    425.91x = 639.39 × 404.39
  4. Step 4: Simplify right side
    425.91x = 258,559.73
  5. Step 5: Solve for x
    x = 258,559.73/425.91
  6. Step 6: Final answer
    x = 607.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.