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Finding the Fourth Proportional to 426.08, 638.98 and 243.54

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Solution

The fourth proportional to 426.08, 638.98 and 243.54 is: 365.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.08 : 638.98 = 243.54 : x
  2. Step 2: Convert to fraction form
    426.08/638.98 = 243.54/x
  3. Step 3: Cross multiply
    426.08x = 638.98 × 243.54
  4. Step 4: Simplify right side
    426.08x = 155,616.58
  5. Step 5: Solve for x
    x = 155,616.58/426.08
  6. Step 6: Final answer
    x = 365.23

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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.