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Finding the Third Proportional to 18,987.75 and 20,607.75

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Solution

The third proportional to 18,987.75 and 20,607.75 is: 22,365.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.75 : 20,607.75 = 20,607.75 : x
  2. Step 2: Convert to fraction form
    18,987.75/20,607.75 = 20,607.75/x
  3. Step 3: Cross multiply
    18,987.75x = 20,607.75 × 20,607.75
  4. Step 4: Simplify right side
    18,987.75x = 424,679,360.06
  5. Step 5: Solve for x
    x = 424,679,360.06/18,987.75
  6. Step 6: Final answer
    x = 22,365.97

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.