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Finding the Third Proportional to 90,408 and 136,272

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Solution

The third proportional to 90,408 and 136,272 is: 205,402.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,408 : 136,272 = 136,272 : x
  2. Step 2: Convert to fraction form
    90,408/136,272 = 136,272/x
  3. Step 3: Cross multiply
    90,408x = 136,272 × 136,272
  4. Step 4: Simplify right side
    90,408x = 18,570,057,984
  5. Step 5: Solve for x
    x = 18,570,057,984/90,408
  6. Step 6: Final answer
    x = 205,402.82

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.