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Finding the Fourth Proportional to 331.49, 457.42 and 205.40

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Solution

The fourth proportional to 331.49, 457.42 and 205.40 is: 283.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.49 : 457.42 = 205.40 : x
  2. Step 2: Convert to fraction form
    331.49/457.42 = 205.40/x
  3. Step 3: Cross multiply
    331.49x = 457.42 × 205.40
  4. Step 4: Simplify right side
    331.49x = 93,951.17
  5. Step 5: Solve for x
    x = 93,951.17/331.49
  6. Step 6: Final answer
    x = 283.42

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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.