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Finding the Fourth Proportional to 426.33, 638.42 and 349.47

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Solution

The fourth proportional to 426.33, 638.42 and 349.47 is: 523.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.33 : 638.42 = 349.47 : x
  2. Step 2: Convert to fraction form
    426.33/638.42 = 349.47/x
  3. Step 3: Cross multiply
    426.33x = 638.42 × 349.47
  4. Step 4: Simplify right side
    426.33x = 223,106.89
  5. Step 5: Solve for x
    x = 223,106.89/426.33
  6. Step 6: Final answer
    x = 523.32

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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.