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Finding the Third Proportional to 198,778 and 431,216

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Solution

The third proportional to 198,778 and 431,216 is: 935,451.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,778 : 431,216 = 431,216 : x
  2. Step 2: Convert to fraction form
    198,778/431,216 = 431,216/x
  3. Step 3: Cross multiply
    198,778x = 431,216 × 431,216
  4. Step 4: Simplify right side
    198,778x = 185,947,238,656
  5. Step 5: Solve for x
    x = 185,947,238,656/198,778
  6. Step 6: Final answer
    x = 935,451.80

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.