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Finding the Fourth Proportional to 0.48, 0.67 and 0.28

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Solution

The fourth proportional to 0.48, 0.67 and 0.28 is: 0.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    0.48 : 0.67 = 0.28 : x
  2. Step 2: Convert to fraction form
    0.48/0.67 = 0.28/x
  3. Step 3: Cross multiply
    0.48x = 0.67 × 0.28
  4. Step 4: Simplify right side
    0.48x = 0.19
  5. Step 5: Solve for x
    x = 0.19/0.48
  6. Step 6: Final answer
    x = 0.39

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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.