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Finding the Third Proportional to 8,920 and 12,664

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Solution

The third proportional to 8,920 and 12,664 is: 17,979.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920 : 12,664 = 12,664 : x
  2. Step 2: Convert to fraction form
    8,920/12,664 = 12,664/x
  3. Step 3: Cross multiply
    8,920x = 12,664 × 12,664
  4. Step 4: Simplify right side
    8,920x = 160,376,896
  5. Step 5: Solve for x
    x = 160,376,896/8,920
  6. Step 6: Final answer
    x = 17,979.47

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.