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Finding the Third Proportional to 1.69 and 3.72

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Solution

The third proportional to 1.69 and 3.72 is: 8.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.69 : 3.72 = 3.72 : x
  2. Step 2: Convert to fraction form
    1.69/3.72 = 3.72/x
  3. Step 3: Cross multiply
    1.69x = 3.72 × 3.72
  4. Step 4: Simplify right side
    1.69x = 13.82
  5. Step 5: Solve for x
    x = 13.82/1.69
  6. Step 6: Final answer
    x = 8.19

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.