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Finding the Fourth Proportional to 427.57, 641.39 and 404.49

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Solution

The fourth proportional to 427.57, 641.39 and 404.49 is: 606.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.57 : 641.39 = 404.49 : x
  2. Step 2: Convert to fraction form
    427.57/641.39 = 404.49/x
  3. Step 3: Cross multiply
    427.57x = 641.39 × 404.49
  4. Step 4: Simplify right side
    427.57x = 259,433.82
  5. Step 5: Solve for x
    x = 259,433.82/427.57
  6. Step 6: Final answer
    x = 606.76

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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.