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Finding the Fourth Proportional to 625.49, 863.83 and 487.25

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Solution

The fourth proportional to 625.49, 863.83 and 487.25 is: 672.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.49 : 863.83 = 487.25 : x
  2. Step 2: Convert to fraction form
    625.49/863.83 = 487.25/x
  3. Step 3: Cross multiply
    625.49x = 863.83 × 487.25
  4. Step 4: Simplify right side
    625.49x = 420,900.70
  5. Step 5: Solve for x
    x = 420,900.70/625.49
  6. Step 6: Final answer
    x = 672.91

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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.