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Finding the Fourth Proportional to 408.96, 611.89 and 243.81

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Solution

The fourth proportional to 408.96, 611.89 and 243.81 is: 364.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.96 : 611.89 = 243.81 : x
  2. Step 2: Convert to fraction form
    408.96/611.89 = 243.81/x
  3. Step 3: Cross multiply
    408.96x = 611.89 × 243.81
  4. Step 4: Simplify right side
    408.96x = 149,184.90
  5. Step 5: Solve for x
    x = 149,184.90/408.96
  6. Step 6: Final answer
    x = 364.79

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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.