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Finding the Third Proportional to 1.78 and 3.51

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Solution

The third proportional to 1.78 and 3.51 is: 6.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.78 : 3.51 = 3.51 : x
  2. Step 2: Convert to fraction form
    1.78/3.51 = 3.51/x
  3. Step 3: Cross multiply
    1.78x = 3.51 × 3.51
  4. Step 4: Simplify right side
    1.78x = 12.30
  5. Step 5: Solve for x
    x = 12.30/1.78
  6. Step 6: Final answer
    x = 6.90

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Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.