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Finding the Fourth Proportional to 426.38, 639.72 and 272.46

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Solution

The fourth proportional to 426.38, 639.72 and 272.46 is: 408.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.38 : 639.72 = 272.46 : x
  2. Step 2: Convert to fraction form
    426.38/639.72 = 272.46/x
  3. Step 3: Cross multiply
    426.38x = 639.72 × 272.46
  4. Step 4: Simplify right side
    426.38x = 174,298.11
  5. Step 5: Solve for x
    x = 174,298.11/426.38
  6. Step 6: Final answer
    x = 408.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.