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Finding the Third Proportional to 12,440 and 18,920

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Solution

The third proportional to 12,440 and 18,920 is: 28,775.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,440 : 18,920 = 18,920 : x
  2. Step 2: Convert to fraction form
    12,440/18,920 = 18,920/x
  3. Step 3: Cross multiply
    12,440x = 18,920 × 18,920
  4. Step 4: Simplify right side
    12,440x = 357,966,400
  5. Step 5: Solve for x
    x = 357,966,400/12,440
  6. Step 6: Final answer
    x = 28,775.43

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.