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Finding the Fourth Proportional to 331.15, 457.09 and 198.47

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Solution

The fourth proportional to 331.15, 457.09 and 198.47 is: 273.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.15 : 457.09 = 198.47 : x
  2. Step 2: Convert to fraction form
    331.15/457.09 = 198.47/x
  3. Step 3: Cross multiply
    331.15x = 457.09 × 198.47
  4. Step 4: Simplify right side
    331.15x = 90,715.87
  5. Step 5: Solve for x
    x = 90,715.87/331.15
  6. Step 6: Final answer
    x = 273.94

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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.