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Finding the Third Proportional to 86,688 and 129,681

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Solution

The third proportional to 86,688 and 129,681 is: 193,996.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,688 : 129,681 = 129,681 : x
  2. Step 2: Convert to fraction form
    86,688/129,681 = 129,681/x
  3. Step 3: Cross multiply
    86,688x = 129,681 × 129,681
  4. Step 4: Simplify right side
    86,688x = 16,817,161,761
  5. Step 5: Solve for x
    x = 16,817,161,761/86,688
  6. Step 6: Final answer
    x = 193,996.42

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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.