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Finding the Third Proportional to 76,989 and 115,171

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Solution

The third proportional to 76,989 and 115,171 is: 172,289.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,989 : 115,171 = 115,171 : x
  2. Step 2: Convert to fraction form
    76,989/115,171 = 115,171/x
  3. Step 3: Cross multiply
    76,989x = 115,171 × 115,171
  4. Step 4: Simplify right side
    76,989x = 13,264,359,241
  5. Step 5: Solve for x
    x = 13,264,359,241/76,989
  6. Step 6: Final answer
    x = 172,289.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.