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Finding the Third Proportional to 18,489 and 40,430

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Solution

The third proportional to 18,489 and 40,430 is: 88,408.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,489 : 40,430 = 40,430 : x
  2. Step 2: Convert to fraction form
    18,489/40,430 = 40,430/x
  3. Step 3: Cross multiply
    18,489x = 40,430 × 40,430
  4. Step 4: Simplify right side
    18,489x = 1,634,584,900
  5. Step 5: Solve for x
    x = 1,634,584,900/18,489
  6. Step 6: Final answer
    x = 88,408.51

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.