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Finding the Fourth Proportional to 625.75, 863.05 and 486.29

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Solution

The fourth proportional to 625.75, 863.05 and 486.29 is: 670.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.75 : 863.05 = 486.29 : x
  2. Step 2: Convert to fraction form
    625.75/863.05 = 486.29/x
  3. Step 3: Cross multiply
    625.75x = 863.05 × 486.29
  4. Step 4: Simplify right side
    625.75x = 419,692.58
  5. Step 5: Solve for x
    x = 419,692.58/625.75
  6. Step 6: Final answer
    x = 670.70

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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.