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Finding the Fourth Proportional to 426.30, 638.90 and 243.42

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Solution

The fourth proportional to 426.30, 638.90 and 243.42 is: 364.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.30 : 638.90 = 243.42 : x
  2. Step 2: Convert to fraction form
    426.30/638.90 = 243.42/x
  3. Step 3: Cross multiply
    426.30x = 638.90 × 243.42
  4. Step 4: Simplify right side
    426.30x = 155,521.04
  5. Step 5: Solve for x
    x = 155,521.04/426.30
  6. Step 6: Final answer
    x = 364.82

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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.