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Finding the Fourth Proportional to 625.73, 863.19 and 389.61

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Solution

The fourth proportional to 625.73, 863.19 and 389.61 is: 537.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.73 : 863.19 = 389.61 : x
  2. Step 2: Convert to fraction form
    625.73/863.19 = 389.61/x
  3. Step 3: Cross multiply
    625.73x = 863.19 × 389.61
  4. Step 4: Simplify right side
    625.73x = 336,307.46
  5. Step 5: Solve for x
    x = 336,307.46/625.73
  6. Step 6: Final answer
    x = 537.47

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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.