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Finding the Fourth Proportional to 2.20, 3.26 and 2.15

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Solution

The fourth proportional to 2.20, 3.26 and 2.15 is: 3.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.20 : 3.26 = 2.15 : x
  2. Step 2: Convert to fraction form
    2.20/3.26 = 2.15/x
  3. Step 3: Cross multiply
    2.20x = 3.26 × 2.15
  4. Step 4: Simplify right side
    2.20x = 7.01
  5. Step 5: Solve for x
    x = 7.01/2.20
  6. Step 6: Final answer
    x = 3.19

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.