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Finding the Fourth Proportional to 309.57, 426.94 and 198.87

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Solution

The fourth proportional to 309.57, 426.94 and 198.87 is: 274.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.57 : 426.94 = 198.87 : x
  2. Step 2: Convert to fraction form
    309.57/426.94 = 198.87/x
  3. Step 3: Cross multiply
    309.57x = 426.94 × 198.87
  4. Step 4: Simplify right side
    309.57x = 84,905.56
  5. Step 5: Solve for x
    x = 84,905.56/309.57
  6. Step 6: Final answer
    x = 274.27

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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.