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Finding the Third Proportional to 6,390 and 11,418

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Solution

The third proportional to 6,390 and 11,418 is: 20,402.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,390 : 11,418 = 11,418 : x
  2. Step 2: Convert to fraction form
    6,390/11,418 = 11,418/x
  3. Step 3: Cross multiply
    6,390x = 11,418 × 11,418
  4. Step 4: Simplify right side
    6,390x = 130,370,724
  5. Step 5: Solve for x
    x = 130,370,724/6,390
  6. Step 6: Final answer
    x = 20,402.30

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Why These Related Problems?

These problems maintain the same ratio (1.79) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.