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Finding the Third Proportional to 12.79 and 16.40

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Solution

The third proportional to 12.79 and 16.40 is: 21.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.79 : 16.40 = 16.40 : x
  2. Step 2: Convert to fraction form
    12.79/16.40 = 16.40/x
  3. Step 3: Cross multiply
    12.79x = 16.40 × 16.40
  4. Step 4: Simplify right side
    12.79x = 269.11
  5. Step 5: Solve for x
    x = 269.11/12.79
  6. Step 6: Final answer
    x = 21.04

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.