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Finding the Third Proportional to 7,920 and 12,540

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Solution

The third proportional to 7,920 and 12,540 is: 19,855

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920 : 12,540 = 12,540 : x
  2. Step 2: Convert to fraction form
    7,920/12,540 = 12,540/x
  3. Step 3: Cross multiply
    7,920x = 12,540 × 12,540
  4. Step 4: Simplify right side
    7,920x = 157,251,600
  5. Step 5: Solve for x
    x = 157,251,600/7,920
  6. Step 6: Final answer
    x = 19,855

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.