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Finding the Third Proportional to 57 and 86

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Solution

The third proportional to 57 and 86 is: 129.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    57 : 86 = 86 : x
  2. Step 2: Convert to fraction form
    57/86 = 86/x
  3. Step 3: Cross multiply
    57x = 86 × 86
  4. Step 4: Simplify right side
    57x = 7,396
  5. Step 5: Solve for x
    x = 7,396/57
  6. Step 6: Final answer
    x = 129.75

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.