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Finding the Third Proportional to 1.80 and 3.86

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Solution

The third proportional to 1.80 and 3.86 is: 8.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.80 : 3.86 = 3.86 : x
  2. Step 2: Convert to fraction form
    1.80/3.86 = 3.86/x
  3. Step 3: Cross multiply
    1.80x = 3.86 × 3.86
  4. Step 4: Simplify right side
    1.80x = 14.93
  5. Step 5: Solve for x
    x = 14.93/1.80
  6. Step 6: Final answer
    x = 8.31

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.