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Finding the Fourth Proportional to 309.28, 426.72 and 198.76

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Solution

The fourth proportional to 309.28, 426.72 and 198.76 is: 274.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.28 : 426.72 = 198.76 : x
  2. Step 2: Convert to fraction form
    309.28/426.72 = 198.76/x
  3. Step 3: Cross multiply
    309.28x = 426.72 × 198.76
  4. Step 4: Simplify right side
    309.28x = 84,814.87
  5. Step 5: Solve for x
    x = 84,814.87/309.28
  6. Step 6: Final answer
    x = 274.23

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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.