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Finding the Fourth Proportional to 426.03, 638.79 and 191.73

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Solution

The fourth proportional to 426.03, 638.79 and 191.73 is: 287.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.03 : 638.79 = 191.73 : x
  2. Step 2: Convert to fraction form
    426.03/638.79 = 191.73/x
  3. Step 3: Cross multiply
    426.03x = 638.79 × 191.73
  4. Step 4: Simplify right side
    426.03x = 122,472.01
  5. Step 5: Solve for x
    x = 122,472.01/426.03
  6. Step 6: Final answer
    x = 287.47

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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.