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Finding the Third Proportional to 1.21 and 1.71

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Solution

The third proportional to 1.21 and 1.71 is: 2.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.21 : 1.71 = 1.71 : x
  2. Step 2: Convert to fraction form
    1.21/1.71 = 1.71/x
  3. Step 3: Cross multiply
    1.21x = 1.71 × 1.71
  4. Step 4: Simplify right side
    1.21x = 2.94
  5. Step 5: Solve for x
    x = 2.94/1.21
  6. Step 6: Final answer
    x = 2.42

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.