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Finding the Third Proportional to 16,640 and 18,896

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Solution

The third proportional to 16,640 and 18,896 is: 21,457.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,640 : 18,896 = 18,896 : x
  2. Step 2: Convert to fraction form
    16,640/18,896 = 18,896/x
  3. Step 3: Cross multiply
    16,640x = 18,896 × 18,896
  4. Step 4: Simplify right side
    16,640x = 357,058,816
  5. Step 5: Solve for x
    x = 357,058,816/16,640
  6. Step 6: Final answer
    x = 21,457.86

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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.