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Finding the Third Proportional to 5,640 and 12,999

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Solution

The third proportional to 5,640 and 12,999 is: 29,959.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,640 : 12,999 = 12,999 : x
  2. Step 2: Convert to fraction form
    5,640/12,999 = 12,999/x
  3. Step 3: Cross multiply
    5,640x = 12,999 × 12,999
  4. Step 4: Simplify right side
    5,640x = 168,974,001
  5. Step 5: Solve for x
    x = 168,974,001/5,640
  6. Step 6: Final answer
    x = 29,959.93

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Why These Related Problems?

These problems maintain the same ratio (2.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.