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Finding the Fourth Proportional to 425.86, 638.89 and 243.20

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Solution

The fourth proportional to 425.86, 638.89 and 243.20 is: 364.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.86 : 638.89 = 243.20 : x
  2. Step 2: Convert to fraction form
    425.86/638.89 = 243.20/x
  3. Step 3: Cross multiply
    425.86x = 638.89 × 243.20
  4. Step 4: Simplify right side
    425.86x = 155,379.04
  5. Step 5: Solve for x
    x = 155,379.04/425.86
  6. Step 6: Final answer
    x = 364.86

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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.