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Finding the Fourth Proportional to 331.20, 456.57 and 248.31

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Solution

The fourth proportional to 331.20, 456.57 and 248.31 is: 342.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.20 : 456.57 = 248.31 : x
  2. Step 2: Convert to fraction form
    331.20/456.57 = 248.31/x
  3. Step 3: Cross multiply
    331.20x = 456.57 × 248.31
  4. Step 4: Simplify right side
    331.20x = 113,370.90
  5. Step 5: Solve for x
    x = 113,370.90/331.20
  6. Step 6: Final answer
    x = 342.30

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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.