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Finding the Fourth Proportional to 426.48, 638.91 and 252.78

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Solution

The fourth proportional to 426.48, 638.91 and 252.78 is: 378.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.48 : 638.91 = 252.78 : x
  2. Step 2: Convert to fraction form
    426.48/638.91 = 252.78/x
  3. Step 3: Cross multiply
    426.48x = 638.91 × 252.78
  4. Step 4: Simplify right side
    426.48x = 161,503.67
  5. Step 5: Solve for x
    x = 161,503.67/426.48
  6. Step 6: Final answer
    x = 378.69

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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.