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Finding the Third Proportional to 82,971 and 128,688.75

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Solution

The third proportional to 82,971 and 128,688.75 is: 199,597.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,971 : 128,688.75 = 128,688.75 : x
  2. Step 2: Convert to fraction form
    82,971/128,688.75 = 128,688.75/x
  3. Step 3: Cross multiply
    82,971x = 128,688.75 × 128,688.75
  4. Step 4: Simplify right side
    82,971x = 16,560,794,376.56
  5. Step 5: Solve for x
    x = 16,560,794,376.56/82,971
  6. Step 6: Final answer
    x = 199,597.38

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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.