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Finding the Third Proportional to 15,578 and 20,991

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Solution

The third proportional to 15,578 and 20,991 is: 28,284.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,578 : 20,991 = 20,991 : x
  2. Step 2: Convert to fraction form
    15,578/20,991 = 20,991/x
  3. Step 3: Cross multiply
    15,578x = 20,991 × 20,991
  4. Step 4: Simplify right side
    15,578x = 440,622,081
  5. Step 5: Solve for x
    x = 440,622,081/15,578
  6. Step 6: Final answer
    x = 28,284.89

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.