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Finding the Third Proportional to 12,720 and 19,770

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Solution

The third proportional to 12,720 and 19,770 is: 30,727.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,720 : 19,770 = 19,770 : x
  2. Step 2: Convert to fraction form
    12,720/19,770 = 19,770/x
  3. Step 3: Cross multiply
    12,720x = 19,770 × 19,770
  4. Step 4: Simplify right side
    12,720x = 390,852,900
  5. Step 5: Solve for x
    x = 390,852,900/12,720
  6. Step 6: Final answer
    x = 30,727.43

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.