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Finding the Third Proportional to 1.21 and 2.88

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Solution

The third proportional to 1.21 and 2.88 is: 6.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.21 : 2.88 = 2.88 : x
  2. Step 2: Convert to fraction form
    1.21/2.88 = 2.88/x
  3. Step 3: Cross multiply
    1.21x = 2.88 × 2.88
  4. Step 4: Simplify right side
    1.21x = 8.30
  5. Step 5: Solve for x
    x = 8.30/1.21
  6. Step 6: Final answer
    x = 6.85

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Why These Related Problems?

These problems maintain the same ratio (2.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.