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Finding the Fourth Proportional to 54.43, 81.65 and 21.94

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Solution

The fourth proportional to 54.43, 81.65 and 21.94 is: 32.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.43 : 81.65 = 21.94 : x
  2. Step 2: Convert to fraction form
    54.43/81.65 = 21.94/x
  3. Step 3: Cross multiply
    54.43x = 81.65 × 21.94
  4. Step 4: Simplify right side
    54.43x = 1,791.25
  5. Step 5: Solve for x
    x = 1,791.25/54.43
  6. Step 6: Final answer
    x = 32.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.