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Finding the Fourth Proportional to 28.22, 42.12 and 22.23

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Solution

The fourth proportional to 28.22, 42.12 and 22.23 is: 33.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.22 : 42.12 = 22.23 : x
  2. Step 2: Convert to fraction form
    28.22/42.12 = 22.23/x
  3. Step 3: Cross multiply
    28.22x = 42.12 × 22.23
  4. Step 4: Simplify right side
    28.22x = 936.33
  5. Step 5: Solve for x
    x = 936.33/28.22
  6. Step 6: Final answer
    x = 33.19

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.