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Finding the Fourth Proportional to 33.96, 50.94 and 21.78

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Solution

The fourth proportional to 33.96, 50.94 and 21.78 is: 32.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.96 : 50.94 = 21.78 : x
  2. Step 2: Convert to fraction form
    33.96/50.94 = 21.78/x
  3. Step 3: Cross multiply
    33.96x = 50.94 × 21.78
  4. Step 4: Simplify right side
    33.96x = 1,109.47
  5. Step 5: Solve for x
    x = 1,109.47/33.96
  6. Step 6: Final answer
    x = 32.67

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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.