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Finding the Third Proportional to 3,960 and 8,658

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Solution

The third proportional to 3,960 and 8,658 is: 18,929.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,960 : 8,658 = 8,658 : x
  2. Step 2: Convert to fraction form
    3,960/8,658 = 8,658/x
  3. Step 3: Cross multiply
    3,960x = 8,658 × 8,658
  4. Step 4: Simplify right side
    3,960x = 74,960,964
  5. Step 5: Solve for x
    x = 74,960,964/3,960
  6. Step 6: Final answer
    x = 18,929.54

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.