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Finding the Fourth Proportional to 54.36, 81.69 and 50.79

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Solution

The fourth proportional to 54.36, 81.69 and 50.79 is: 76.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.36 : 81.69 = 50.79 : x
  2. Step 2: Convert to fraction form
    54.36/81.69 = 50.79/x
  3. Step 3: Cross multiply
    54.36x = 81.69 × 50.79
  4. Step 4: Simplify right side
    54.36x = 4,149.04
  5. Step 5: Solve for x
    x = 4,149.04/54.36
  6. Step 6: Final answer
    x = 76.33

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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.