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Finding the Fourth Proportional to 22.12, 30.31 and 21.91

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Solution

The fourth proportional to 22.12, 30.31 and 21.91 is: 30.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.12 : 30.31 = 21.91 : x
  2. Step 2: Convert to fraction form
    22.12/30.31 = 21.91/x
  3. Step 3: Cross multiply
    22.12x = 30.31 × 21.91
  4. Step 4: Simplify right side
    22.12x = 664.09
  5. Step 5: Solve for x
    x = 664.09/22.12
  6. Step 6: Final answer
    x = 30.02

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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.