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Finding the Fourth Proportional to 33.95, 50.79 and 21.11

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Solution

The fourth proportional to 33.95, 50.79 and 21.11 is: 31.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.95 : 50.79 = 21.11 : x
  2. Step 2: Convert to fraction form
    33.95/50.79 = 21.11/x
  3. Step 3: Cross multiply
    33.95x = 50.79 × 21.11
  4. Step 4: Simplify right side
    33.95x = 1,072.18
  5. Step 5: Solve for x
    x = 1,072.18/33.95
  6. Step 6: Final answer
    x = 31.58

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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.