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Finding the Fourth Proportional to 0.21, 0.32 and 0.18

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Solution

The fourth proportional to 0.21, 0.32 and 0.18 is: 0.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    0.21 : 0.32 = 0.18 : x
  2. Step 2: Convert to fraction form
    0.21/0.32 = 0.18/x
  3. Step 3: Cross multiply
    0.21x = 0.32 × 0.18
  4. Step 4: Simplify right side
    0.21x = 0.06
  5. Step 5: Solve for x
    x = 0.06/0.21
  6. Step 6: Final answer
    x = 0.28

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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.