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Finding the Fourth Proportional to 425.69, 638.25 and 242.82

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Solution

The fourth proportional to 425.69, 638.25 and 242.82 is: 364.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.69 : 638.25 = 242.82 : x
  2. Step 2: Convert to fraction form
    425.69/638.25 = 242.82/x
  3. Step 3: Cross multiply
    425.69x = 638.25 × 242.82
  4. Step 4: Simplify right side
    425.69x = 154,979.87
  5. Step 5: Solve for x
    x = 154,979.87/425.69
  6. Step 6: Final answer
    x = 364.07

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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.