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Finding the Third Proportional to 128,778 and 199,230

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Solution

The third proportional to 128,778 and 199,230 is: 308,224.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,778 : 199,230 = 199,230 : x
  2. Step 2: Convert to fraction form
    128,778/199,230 = 199,230/x
  3. Step 3: Cross multiply
    128,778x = 199,230 × 199,230
  4. Step 4: Simplify right side
    128,778x = 39,692,592,900
  5. Step 5: Solve for x
    x = 39,692,592,900/128,778
  6. Step 6: Final answer
    x = 308,224.95

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.