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Finding the Fourth Proportional to 323.28, 485.31 and 186.39

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Solution

The fourth proportional to 323.28, 485.31 and 186.39 is: 279.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.28 : 485.31 = 186.39 : x
  2. Step 2: Convert to fraction form
    323.28/485.31 = 186.39/x
  3. Step 3: Cross multiply
    323.28x = 485.31 × 186.39
  4. Step 4: Simplify right side
    323.28x = 90,456.93
  5. Step 5: Solve for x
    x = 90,456.93/323.28
  6. Step 6: Final answer
    x = 279.81

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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.