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Finding the Fourth Proportional to 625.44, 863.42 and 389.46

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Solution

The fourth proportional to 625.44, 863.42 and 389.46 is: 537.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.44 : 863.42 = 389.46 : x
  2. Step 2: Convert to fraction form
    625.44/863.42 = 389.46/x
  3. Step 3: Cross multiply
    625.44x = 863.42 × 389.46
  4. Step 4: Simplify right side
    625.44x = 336,267.55
  5. Step 5: Solve for x
    x = 336,267.55/625.44
  6. Step 6: Final answer
    x = 537.65

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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.