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Finding the Third Proportional to 1.20 and 2.61

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Solution

The third proportional to 1.20 and 2.61 is: 5.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.20 : 2.61 = 2.61 : x
  2. Step 2: Convert to fraction form
    1.20/2.61 = 2.61/x
  3. Step 3: Cross multiply
    1.20x = 2.61 × 2.61
  4. Step 4: Simplify right side
    1.20x = 6.81
  5. Step 5: Solve for x
    x = 6.81/1.20
  6. Step 6: Final answer
    x = 5.67

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.