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Finding the Fourth Proportional to 33.92, 50.88 and 20.40

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Solution

The fourth proportional to 33.92, 50.88 and 20.40 is: 30.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.92 : 50.88 = 20.40 : x
  2. Step 2: Convert to fraction form
    33.92/50.88 = 20.40/x
  3. Step 3: Cross multiply
    33.92x = 50.88 × 20.40
  4. Step 4: Simplify right side
    33.92x = 1,037.95
  5. Step 5: Solve for x
    x = 1,037.95/33.92
  6. Step 6: Final answer
    x = 30.60

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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.