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Finding the Fourth Proportional to 30.62, 42.22 and 21.44

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Solution

The fourth proportional to 30.62, 42.22 and 21.44 is: 29.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.62 : 42.22 = 21.44 : x
  2. Step 2: Convert to fraction form
    30.62/42.22 = 21.44/x
  3. Step 3: Cross multiply
    30.62x = 42.22 × 21.44
  4. Step 4: Simplify right side
    30.62x = 905.20
  5. Step 5: Solve for x
    x = 905.20/30.62
  6. Step 6: Final answer
    x = 29.56

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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.