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Finding the Third Proportional to 71,372 and 99,787

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Solution

The third proportional to 71,372 and 99,787 is: 139,514.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,372 : 99,787 = 99,787 : x
  2. Step 2: Convert to fraction form
    71,372/99,787 = 99,787/x
  3. Step 3: Cross multiply
    71,372x = 99,787 × 99,787
  4. Step 4: Simplify right side
    71,372x = 9,957,445,369
  5. Step 5: Solve for x
    x = 9,957,445,369/71,372
  6. Step 6: Final answer
    x = 139,514.73

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.