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Finding the Fourth Proportional to 323.84, 445.78 and 281.80

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Solution

The fourth proportional to 323.84, 445.78 and 281.80 is: 387.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.84 : 445.78 = 281.80 : x
  2. Step 2: Convert to fraction form
    323.84/445.78 = 281.80/x
  3. Step 3: Cross multiply
    323.84x = 445.78 × 281.80
  4. Step 4: Simplify right side
    323.84x = 125,620.80
  5. Step 5: Solve for x
    x = 125,620.80/323.84
  6. Step 6: Final answer
    x = 387.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.