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Finding the Fourth Proportional to 426.20, 638.70 and 243.32

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Solution

The fourth proportional to 426.20, 638.70 and 243.32 is: 364.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.20 : 638.70 = 243.32 : x
  2. Step 2: Convert to fraction form
    426.20/638.70 = 243.32/x
  3. Step 3: Cross multiply
    426.20x = 638.70 × 243.32
  4. Step 4: Simplify right side
    426.20x = 155,408.48
  5. Step 5: Solve for x
    x = 155,408.48/426.20
  6. Step 6: Final answer
    x = 364.64

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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.