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Finding the Third Proportional to 12,679 and 19,889

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Solution

The third proportional to 12,679 and 19,889 is: 31,199.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,679 : 19,889 = 19,889 : x
  2. Step 2: Convert to fraction form
    12,679/19,889 = 19,889/x
  3. Step 3: Cross multiply
    12,679x = 19,889 × 19,889
  4. Step 4: Simplify right side
    12,679x = 395,572,321
  5. Step 5: Solve for x
    x = 395,572,321/12,679
  6. Step 6: Final answer
    x = 31,199.02

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.