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Finding the Fourth Proportional to 34.22, 47.21 and 21.94

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Solution

The fourth proportional to 34.22, 47.21 and 21.94 is: 30.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.22 : 47.21 = 21.94 : x
  2. Step 2: Convert to fraction form
    34.22/47.21 = 21.94/x
  3. Step 3: Cross multiply
    34.22x = 47.21 × 21.94
  4. Step 4: Simplify right side
    34.22x = 1,035.55
  5. Step 5: Solve for x
    x = 1,035.55/34.22
  6. Step 6: Final answer
    x = 30.27

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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.