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Finding the Fourth Proportional to 21.73, 29.97 and 14.81

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Solution

The fourth proportional to 21.73, 29.97 and 14.81 is: 20.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.73 : 29.97 = 14.81 : x
  2. Step 2: Convert to fraction form
    21.73/29.97 = 14.81/x
  3. Step 3: Cross multiply
    21.73x = 29.97 × 14.81
  4. Step 4: Simplify right side
    21.73x = 443.63
  5. Step 5: Solve for x
    x = 443.63/21.73
  6. Step 6: Final answer
    x = 20.42

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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.