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Finding the Third Proportional to 3,390 and 6,420

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Solution

The third proportional to 3,390 and 6,420 is: 12,158.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,390 : 6,420 = 6,420 : x
  2. Step 2: Convert to fraction form
    3,390/6,420 = 6,420/x
  3. Step 3: Cross multiply
    3,390x = 6,420 × 6,420
  4. Step 4: Simplify right side
    3,390x = 41,216,400
  5. Step 5: Solve for x
    x = 41,216,400/3,390
  6. Step 6: Final answer
    x = 12,158.23

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Why These Related Problems?

These problems maintain the same ratio (1.89) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.