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Finding the Fourth Proportional to 33.96, 50.88 and 20.42

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Solution

The fourth proportional to 33.96, 50.88 and 20.42 is: 30.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.96 : 50.88 = 20.42 : x
  2. Step 2: Convert to fraction form
    33.96/50.88 = 20.42/x
  3. Step 3: Cross multiply
    33.96x = 50.88 × 20.42
  4. Step 4: Simplify right side
    33.96x = 1,038.97
  5. Step 5: Solve for x
    x = 1,038.97/33.96
  6. Step 6: Final answer
    x = 30.59

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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.