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Finding the Third Proportional to 12,989 and 18,309

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Solution

The third proportional to 12,989 and 18,309 is: 25,807.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,989 : 18,309 = 18,309 : x
  2. Step 2: Convert to fraction form
    12,989/18,309 = 18,309/x
  3. Step 3: Cross multiply
    12,989x = 18,309 × 18,309
  4. Step 4: Simplify right side
    12,989x = 335,219,481
  5. Step 5: Solve for x
    x = 335,219,481/12,989
  6. Step 6: Final answer
    x = 25,807.95

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.