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Finding the Fourth Proportional to 425.97, 638.82 and 272.07

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Solution

The fourth proportional to 425.97, 638.82 and 272.07 is: 408.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.97 : 638.82 = 272.07 : x
  2. Step 2: Convert to fraction form
    425.97/638.82 = 272.07/x
  3. Step 3: Cross multiply
    425.97x = 638.82 × 272.07
  4. Step 4: Simplify right side
    425.97x = 173,803.76
  5. Step 5: Solve for x
    x = 173,803.76/425.97
  6. Step 6: Final answer
    x = 408.02

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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.