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Finding the Fourth Proportional to 2.18, 3.26 and 1.88

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Solution

The fourth proportional to 2.18, 3.26 and 1.88 is: 2.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.18 : 3.26 = 1.88 : x
  2. Step 2: Convert to fraction form
    2.18/3.26 = 1.88/x
  3. Step 3: Cross multiply
    2.18x = 3.26 × 1.88
  4. Step 4: Simplify right side
    2.18x = 6.11
  5. Step 5: Solve for x
    x = 6.11/2.18
  6. Step 6: Final answer
    x = 2.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.