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Finding the Fourth Proportional to 426.43, 639.83 and 272.42

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Solution

The fourth proportional to 426.43, 639.83 and 272.42 is: 408.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.43 : 639.83 = 272.42 : x
  2. Step 2: Convert to fraction form
    426.43/639.83 = 272.42/x
  3. Step 3: Cross multiply
    426.43x = 639.83 × 272.42
  4. Step 4: Simplify right side
    426.43x = 174,302.49
  5. Step 5: Solve for x
    x = 174,302.49/426.43
  6. Step 6: Final answer
    x = 408.75

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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.