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Finding the Fourth Proportional to 2.18, 3.28 and 0.85

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Solution

The fourth proportional to 2.18, 3.28 and 0.85 is: 1.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.18 : 3.28 = 0.85 : x
  2. Step 2: Convert to fraction form
    2.18/3.28 = 0.85/x
  3. Step 3: Cross multiply
    2.18x = 3.28 × 0.85
  4. Step 4: Simplify right side
    2.18x = 2.78
  5. Step 5: Solve for x
    x = 2.78/2.18
  6. Step 6: Final answer
    x = 1.27

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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.