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Finding the Third Proportional to 12,310 and 18,920

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Solution

The third proportional to 12,310 and 18,920 is: 29,079.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,310 : 18,920 = 18,920 : x
  2. Step 2: Convert to fraction form
    12,310/18,920 = 18,920/x
  3. Step 3: Cross multiply
    12,310x = 18,920 × 18,920
  4. Step 4: Simplify right side
    12,310x = 357,966,400
  5. Step 5: Solve for x
    x = 357,966,400/12,310
  6. Step 6: Final answer
    x = 29,079.32

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.