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Finding the Fourth Proportional to 0.28, 0.42 and 0.22

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Solution

The fourth proportional to 0.28, 0.42 and 0.22 is: 0.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    0.28 : 0.42 = 0.22 : x
  2. Step 2: Convert to fraction form
    0.28/0.42 = 0.22/x
  3. Step 3: Cross multiply
    0.28x = 0.42 × 0.22
  4. Step 4: Simplify right side
    0.28x = 0.09
  5. Step 5: Solve for x
    x = 0.09/0.28
  6. Step 6: Final answer
    x = 0.32

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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.