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Finding the Third Proportional to 2.55 and 4.86

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Solution

The third proportional to 2.55 and 4.86 is: 9.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.55 : 4.86 = 4.86 : x
  2. Step 2: Convert to fraction form
    2.55/4.86 = 4.86/x
  3. Step 3: Cross multiply
    2.55x = 4.86 × 4.86
  4. Step 4: Simplify right side
    2.55x = 23.63
  5. Step 5: Solve for x
    x = 23.63/2.55
  6. Step 6: Final answer
    x = 9.25

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Why These Related Problems?

These problems maintain the same ratio (1.90) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.