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Finding the Third Proportional to 198.28 and 313.56

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Solution

The third proportional to 198.28 and 313.56 is: 495.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.28 : 313.56 = 313.56 : x
  2. Step 2: Convert to fraction form
    198.28/313.56 = 313.56/x
  3. Step 3: Cross multiply
    198.28x = 313.56 × 313.56
  4. Step 4: Simplify right side
    198.28x = 98,318.99
  5. Step 5: Solve for x
    x = 98,318.99/198.28
  6. Step 6: Final answer
    x = 495.86

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.