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Finding the Third Proportional to 16,720 and 18,988

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Solution

The third proportional to 16,720 and 18,988 is: 21,563.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,720 : 18,988 = 18,988 : x
  2. Step 2: Convert to fraction form
    16,720/18,988 = 18,988/x
  3. Step 3: Cross multiply
    16,720x = 18,988 × 18,988
  4. Step 4: Simplify right side
    16,720x = 360,544,144
  5. Step 5: Solve for x
    x = 360,544,144/16,720
  6. Step 6: Final answer
    x = 21,563.64

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Why These Related Problems?

These problems maintain the same ratio (1.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.