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Finding the Third Proportional to 86,690 and 129,684

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Solution

The third proportional to 86,690 and 129,684 is: 194,000.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,690 : 129,684 = 129,684 : x
  2. Step 2: Convert to fraction form
    86,690/129,684 = 129,684/x
  3. Step 3: Cross multiply
    86,690x = 129,684 × 129,684
  4. Step 4: Simplify right side
    86,690x = 16,817,939,856
  5. Step 5: Solve for x
    x = 16,817,939,856/86,690
  6. Step 6: Final answer
    x = 194,000.92

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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.