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Finding the Third Proportional to 6,389 and 9,879

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Solution

The third proportional to 6,389 and 9,879 is: 15,275.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,389 : 9,879 = 9,879 : x
  2. Step 2: Convert to fraction form
    6,389/9,879 = 9,879/x
  3. Step 3: Cross multiply
    6,389x = 9,879 × 9,879
  4. Step 4: Simplify right side
    6,389x = 97,594,641
  5. Step 5: Solve for x
    x = 97,594,641/6,389
  6. Step 6: Final answer
    x = 15,275.42

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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.