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Finding the Third Proportional to 138,687 and 198,178

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Solution

The third proportional to 138,687 and 198,178 is: 283,188.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,687 : 198,178 = 198,178 : x
  2. Step 2: Convert to fraction form
    138,687/198,178 = 198,178/x
  3. Step 3: Cross multiply
    138,687x = 198,178 × 198,178
  4. Step 4: Simplify right side
    138,687x = 39,274,519,684
  5. Step 5: Solve for x
    x = 39,274,519,684/138,687
  6. Step 6: Final answer
    x = 283,188.18

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.