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Finding the Fourth Proportional to 0.28, 0.39 and 0.18

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Solution

The fourth proportional to 0.28, 0.39 and 0.18 is: 0.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    0.28 : 0.39 = 0.18 : x
  2. Step 2: Convert to fraction form
    0.28/0.39 = 0.18/x
  3. Step 3: Cross multiply
    0.28x = 0.39 × 0.18
  4. Step 4: Simplify right side
    0.28x = 0.07
  5. Step 5: Solve for x
    x = 0.07/0.28
  6. Step 6: Final answer
    x = 0.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.