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Finding the Fourth Proportional to 22.39, 33.55 and 13.80

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Solution

The fourth proportional to 22.39, 33.55 and 13.80 is: 20.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.39 : 33.55 = 13.80 : x
  2. Step 2: Convert to fraction form
    22.39/33.55 = 13.80/x
  3. Step 3: Cross multiply
    22.39x = 33.55 × 13.80
  4. Step 4: Simplify right side
    22.39x = 463.08
  5. Step 5: Solve for x
    x = 463.08/22.39
  6. Step 6: Final answer
    x = 20.68

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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.