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Finding the Third Proportional to 12,988 and 20,351

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Solution

The third proportional to 12,988 and 20,351 is: 31,888.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,988 : 20,351 = 20,351 : x
  2. Step 2: Convert to fraction form
    12,988/20,351 = 20,351/x
  3. Step 3: Cross multiply
    12,988x = 20,351 × 20,351
  4. Step 4: Simplify right side
    12,988x = 414,163,201
  5. Step 5: Solve for x
    x = 414,163,201/12,988
  6. Step 6: Final answer
    x = 31,888.14

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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.