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Finding the Third Proportional to 198.56 and 357.75

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Solution

The third proportional to 198.56 and 357.75 is: 644.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.56 : 357.75 = 357.75 : x
  2. Step 2: Convert to fraction form
    198.56/357.75 = 357.75/x
  3. Step 3: Cross multiply
    198.56x = 357.75 × 357.75
  4. Step 4: Simplify right side
    198.56x = 127,985.06
  5. Step 5: Solve for x
    x = 127,985.06/198.56
  6. Step 6: Final answer
    x = 644.56

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Why These Related Problems?

These problems maintain the same ratio (1.80) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.