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Finding the Third Proportional to 6,420 and 9,817

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Solution

The third proportional to 6,420 and 9,817 is: 15,011.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420 : 9,817 = 9,817 : x
  2. Step 2: Convert to fraction form
    6,420/9,817 = 9,817/x
  3. Step 3: Cross multiply
    6,420x = 9,817 × 9,817
  4. Step 4: Simplify right side
    6,420x = 96,373,489
  5. Step 5: Solve for x
    x = 96,373,489/6,420
  6. Step 6: Final answer
    x = 15,011.45

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.