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Finding the Fourth Proportional to 22.05, 30.39 and 21.36

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Solution

The fourth proportional to 22.05, 30.39 and 21.36 is: 29.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.05 : 30.39 = 21.36 : x
  2. Step 2: Convert to fraction form
    22.05/30.39 = 21.36/x
  3. Step 3: Cross multiply
    22.05x = 30.39 × 21.36
  4. Step 4: Simplify right side
    22.05x = 649.13
  5. Step 5: Solve for x
    x = 649.13/22.05
  6. Step 6: Final answer
    x = 29.44

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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.