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Finding the Third Proportional to 198.56 and 310.69

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Solution

The third proportional to 198.56 and 310.69 is: 486.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.56 : 310.69 = 310.69 : x
  2. Step 2: Convert to fraction form
    198.56/310.69 = 310.69/x
  3. Step 3: Cross multiply
    198.56x = 310.69 × 310.69
  4. Step 4: Simplify right side
    198.56x = 96,526.72
  5. Step 5: Solve for x
    x = 96,526.72/198.56
  6. Step 6: Final answer
    x = 486.13

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.