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Finding the Fourth Proportional to 625.72, 863.42 and 389.71

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Solution

The fourth proportional to 625.72, 863.42 and 389.71 is: 537.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.72 : 863.42 = 389.71 : x
  2. Step 2: Convert to fraction form
    625.72/863.42 = 389.71/x
  3. Step 3: Cross multiply
    625.72x = 863.42 × 389.71
  4. Step 4: Simplify right side
    625.72x = 336,483.41
  5. Step 5: Solve for x
    x = 336,483.41/625.72
  6. Step 6: Final answer
    x = 537.75

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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.