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Finding the Fourth Proportional to 625.55, 863.17 and 392.63

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Solution

The fourth proportional to 625.55, 863.17 and 392.63 is: 541.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.55 : 863.17 = 392.63 : x
  2. Step 2: Convert to fraction form
    625.55/863.17 = 392.63/x
  3. Step 3: Cross multiply
    625.55x = 863.17 × 392.63
  4. Step 4: Simplify right side
    625.55x = 338,901.14
  5. Step 5: Solve for x
    x = 338,901.14/625.55
  6. Step 6: Final answer
    x = 541.77

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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.