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Finding the Third Proportional to 16,686 and 21,777

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Solution

The third proportional to 16,686 and 21,777 is: 28,421.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,686 : 21,777 = 21,777 : x
  2. Step 2: Convert to fraction form
    16,686/21,777 = 21,777/x
  3. Step 3: Cross multiply
    16,686x = 21,777 × 21,777
  4. Step 4: Simplify right side
    16,686x = 474,237,729
  5. Step 5: Solve for x
    x = 474,237,729/16,686
  6. Step 6: Final answer
    x = 28,421.30

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.