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Finding the Fourth Proportional to 426.35, 638.76 and 383.54

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Solution

The fourth proportional to 426.35, 638.76 and 383.54 is: 574.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.35 : 638.76 = 383.54 : x
  2. Step 2: Convert to fraction form
    426.35/638.76 = 383.54/x
  3. Step 3: Cross multiply
    426.35x = 638.76 × 383.54
  4. Step 4: Simplify right side
    426.35x = 244,986.82
  5. Step 5: Solve for x
    x = 244,986.82/426.35
  6. Step 6: Final answer
    x = 574.62

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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.