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Finding the Third Proportional to 13,988 and 21,920

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Solution

The third proportional to 13,988 and 21,920 is: 34,349.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,988 : 21,920 = 21,920 : x
  2. Step 2: Convert to fraction form
    13,988/21,920 = 21,920/x
  3. Step 3: Cross multiply
    13,988x = 21,920 × 21,920
  4. Step 4: Simplify right side
    13,988x = 480,486,400
  5. Step 5: Solve for x
    x = 480,486,400/13,988
  6. Step 6: Final answer
    x = 34,349.90

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.