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Finding the Third Proportional to 6,429 and 9,981

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Solution

The third proportional to 6,429 and 9,981 is: 15,495.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,429 : 9,981 = 9,981 : x
  2. Step 2: Convert to fraction form
    6,429/9,981 = 9,981/x
  3. Step 3: Cross multiply
    6,429x = 9,981 × 9,981
  4. Step 4: Simplify right side
    6,429x = 99,620,361
  5. Step 5: Solve for x
    x = 99,620,361/6,429
  6. Step 6: Final answer
    x = 15,495.47

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.