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Finding the Fourth Proportional to 54.01, 81.04 and 19.78

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Solution

The fourth proportional to 54.01, 81.04 and 19.78 is: 29.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.01 : 81.04 = 19.78 : x
  2. Step 2: Convert to fraction form
    54.01/81.04 = 19.78/x
  3. Step 3: Cross multiply
    54.01x = 81.04 × 19.78
  4. Step 4: Simplify right side
    54.01x = 1,602.97
  5. Step 5: Solve for x
    x = 1,602.97/54.01
  6. Step 6: Final answer
    x = 29.68

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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.