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Finding the Fourth Proportional to 625.14, 863.03 and 438.80

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Solution

The fourth proportional to 625.14, 863.03 and 438.80 is: 605.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.14 : 863.03 = 438.80 : x
  2. Step 2: Convert to fraction form
    625.14/863.03 = 438.80/x
  3. Step 3: Cross multiply
    625.14x = 863.03 × 438.80
  4. Step 4: Simplify right side
    625.14x = 378,694.35
  5. Step 5: Solve for x
    x = 378,694.35/625.14
  6. Step 6: Final answer
    x = 605.78

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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.