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Finding the Fourth Proportional to 33.98, 46.90 and 20.87

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Solution

The fourth proportional to 33.98, 46.90 and 20.87 is: 28.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.98 : 46.90 = 20.87 : x
  2. Step 2: Convert to fraction form
    33.98/46.90 = 20.87/x
  3. Step 3: Cross multiply
    33.98x = 46.90 × 20.87
  4. Step 4: Simplify right side
    33.98x = 978.52
  5. Step 5: Solve for x
    x = 978.52/33.98
  6. Step 6: Final answer
    x = 28.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.