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Finding the Fourth Proportional to 331.45, 457.40 and 200.42

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Solution

The fourth proportional to 331.45, 457.40 and 200.42 is: 276.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.45 : 457.40 = 200.42 : x
  2. Step 2: Convert to fraction form
    331.45/457.40 = 200.42/x
  3. Step 3: Cross multiply
    331.45x = 457.40 × 200.42
  4. Step 4: Simplify right side
    331.45x = 91,672.11
  5. Step 5: Solve for x
    x = 91,672.11/331.45
  6. Step 6: Final answer
    x = 276.58

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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.