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Finding the Third Proportional to 1.42 and 3.12

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Solution

The third proportional to 1.42 and 3.12 is: 6.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.42 : 3.12 = 3.12 : x
  2. Step 2: Convert to fraction form
    1.42/3.12 = 3.12/x
  3. Step 3: Cross multiply
    1.42x = 3.12 × 3.12
  4. Step 4: Simplify right side
    1.42x = 9.76
  5. Step 5: Solve for x
    x = 9.76/1.42
  6. Step 6: Final answer
    x = 6.86

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.