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Finding the Third Proportional to 12.80 and 19.83

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Solution

The third proportional to 12.80 and 19.83 is: 30.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.80 : 19.83 = 19.83 : x
  2. Step 2: Convert to fraction form
    12.80/19.83 = 19.83/x
  3. Step 3: Cross multiply
    12.80x = 19.83 × 19.83
  4. Step 4: Simplify right side
    12.80x = 393.15
  5. Step 5: Solve for x
    x = 393.15/12.80
  6. Step 6: Final answer
    x = 30.72

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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.