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Finding the Third Proportional to 57.09 and 120.80

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Solution

The third proportional to 57.09 and 120.80 is: 255.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.09 : 120.80 = 120.80 : x
  2. Step 2: Convert to fraction form
    57.09/120.80 = 120.80/x
  3. Step 3: Cross multiply
    57.09x = 120.80 × 120.80
  4. Step 4: Simplify right side
    57.09x = 14,591.89
  5. Step 5: Solve for x
    x = 14,591.89/57.09
  6. Step 6: Final answer
    x = 255.58

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.