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Finding the Fourth Proportional to 426.38, 639.68 and 231.34

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Solution

The fourth proportional to 426.38, 639.68 and 231.34 is: 347.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.38 : 639.68 = 231.34 : x
  2. Step 2: Convert to fraction form
    426.38/639.68 = 231.34/x
  3. Step 3: Cross multiply
    426.38x = 639.68 × 231.34
  4. Step 4: Simplify right side
    426.38x = 147,982.55
  5. Step 5: Solve for x
    x = 147,982.55/426.38
  6. Step 6: Final answer
    x = 347.07

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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.