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Finding the Fourth Proportional to 22.36, 30.72 and 20.84

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Solution

The fourth proportional to 22.36, 30.72 and 20.84 is: 28.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.36 : 30.72 = 20.84 : x
  2. Step 2: Convert to fraction form
    22.36/30.72 = 20.84/x
  3. Step 3: Cross multiply
    22.36x = 30.72 × 20.84
  4. Step 4: Simplify right side
    22.36x = 640.20
  5. Step 5: Solve for x
    x = 640.20/22.36
  6. Step 6: Final answer
    x = 28.63

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.