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Finding the Fourth Proportional to 323.86, 485.79 and 220.89

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Solution

The fourth proportional to 323.86, 485.79 and 220.89 is: 331.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.86 : 485.79 = 220.89 : x
  2. Step 2: Convert to fraction form
    323.86/485.79 = 220.89/x
  3. Step 3: Cross multiply
    323.86x = 485.79 × 220.89
  4. Step 4: Simplify right side
    323.86x = 107,306.15
  5. Step 5: Solve for x
    x = 107,306.15/323.86
  6. Step 6: Final answer
    x = 331.34

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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.