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Finding the Third Proportional to 489 and 991

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Solution

The third proportional to 489 and 991 is: 2,008.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    489 : 991 = 991 : x
  2. Step 2: Convert to fraction form
    489/991 = 991/x
  3. Step 3: Cross multiply
    489x = 991 × 991
  4. Step 4: Simplify right side
    489x = 982,081
  5. Step 5: Solve for x
    x = 982,081/489
  6. Step 6: Final answer
    x = 2,008.35

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Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.