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Finding the Third Proportional to 1.42 and 2.21

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Solution

The third proportional to 1.42 and 2.21 is: 3.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.42 : 2.21 = 2.21 : x
  2. Step 2: Convert to fraction form
    1.42/2.21 = 2.21/x
  3. Step 3: Cross multiply
    1.42x = 2.21 × 2.21
  4. Step 4: Simplify right side
    1.42x = 4.91
  5. Step 5: Solve for x
    x = 4.91/1.42
  6. Step 6: Final answer
    x = 3.45

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.