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Finding the Fourth Proportional to 34.25, 47.18 and 21.94

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Solution

The fourth proportional to 34.25, 47.18 and 21.94 is: 30.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.25 : 47.18 = 21.94 : x
  2. Step 2: Convert to fraction form
    34.25/47.18 = 21.94/x
  3. Step 3: Cross multiply
    34.25x = 47.18 × 21.94
  4. Step 4: Simplify right side
    34.25x = 1,035.07
  5. Step 5: Solve for x
    x = 1,035.07/34.25
  6. Step 6: Final answer
    x = 30.23

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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.