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Finding the Third Proportional to 49.92 and 80.16

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Solution

The third proportional to 49.92 and 80.16 is: 128.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.92 : 80.16 = 80.16 : x
  2. Step 2: Convert to fraction form
    49.92/80.16 = 80.16/x
  3. Step 3: Cross multiply
    49.92x = 80.16 × 80.16
  4. Step 4: Simplify right side
    49.92x = 6,425.02
  5. Step 5: Solve for x
    x = 6,425.02/49.92
  6. Step 6: Final answer
    x = 128.70

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.