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Finding the Fourth Proportional to 33.67, 50.60 and 20.87

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Solution

The fourth proportional to 33.67, 50.60 and 20.87 is: 31.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.67 : 50.60 = 20.87 : x
  2. Step 2: Convert to fraction form
    33.67/50.60 = 20.87/x
  3. Step 3: Cross multiply
    33.67x = 50.60 × 20.87
  4. Step 4: Simplify right side
    33.67x = 1,056.02
  5. Step 5: Solve for x
    x = 1,056.02/33.67
  6. Step 6: Final answer
    x = 31.36

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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.