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Finding the Fourth Proportional to 331.21, 457.41 and 248.19

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Solution

The fourth proportional to 331.21, 457.41 and 248.19 is: 342.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.21 : 457.41 = 248.19 : x
  2. Step 2: Convert to fraction form
    331.21/457.41 = 248.19/x
  3. Step 3: Cross multiply
    331.21x = 457.41 × 248.19
  4. Step 4: Simplify right side
    331.21x = 113,524.59
  5. Step 5: Solve for x
    x = 113,524.59/331.21
  6. Step 6: Final answer
    x = 342.76

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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.