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Finding the Third Proportional to 18,989 and 40,786

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Solution

The third proportional to 18,989 and 40,786 is: 87,603.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989 : 40,786 = 40,786 : x
  2. Step 2: Convert to fraction form
    18,989/40,786 = 40,786/x
  3. Step 3: Cross multiply
    18,989x = 40,786 × 40,786
  4. Step 4: Simplify right side
    18,989x = 1,663,497,796
  5. Step 5: Solve for x
    x = 1,663,497,796/18,989
  6. Step 6: Final answer
    x = 87,603.23

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.