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Finding the Fourth Proportional to 331.44, 456.39 and 261.78

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Solution

The fourth proportional to 331.44, 456.39 and 261.78 is: 360.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.44 : 456.39 = 261.78 : x
  2. Step 2: Convert to fraction form
    331.44/456.39 = 261.78/x
  3. Step 3: Cross multiply
    331.44x = 456.39 × 261.78
  4. Step 4: Simplify right side
    331.44x = 119,473.77
  5. Step 5: Solve for x
    x = 119,473.77/331.44
  6. Step 6: Final answer
    x = 360.47

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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.