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Finding the Fourth Proportional to 309.27, 426.67 and 198.79

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Solution

The fourth proportional to 309.27, 426.67 and 198.79 is: 274.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.27 : 426.67 = 198.79 : x
  2. Step 2: Convert to fraction form
    309.27/426.67 = 198.79/x
  3. Step 3: Cross multiply
    309.27x = 426.67 × 198.79
  4. Step 4: Simplify right side
    309.27x = 84,817.73
  5. Step 5: Solve for x
    x = 84,817.73/309.27
  6. Step 6: Final answer
    x = 274.25

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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.