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Finding the Fourth Proportional to 625.28, 862.86 and 392.56

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Solution

The fourth proportional to 625.28, 862.86 and 392.56 is: 541.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.28 : 862.86 = 392.56 : x
  2. Step 2: Convert to fraction form
    625.28/862.86 = 392.56/x
  3. Step 3: Cross multiply
    625.28x = 862.86 × 392.56
  4. Step 4: Simplify right side
    625.28x = 338,724.32
  5. Step 5: Solve for x
    x = 338,724.32/625.28
  6. Step 6: Final answer
    x = 541.72

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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.