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Finding the Fourth Proportional to 54.79, 76.12 and 54.14

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Solution

The fourth proportional to 54.79, 76.12 and 54.14 is: 75.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.79 : 76.12 = 54.14 : x
  2. Step 2: Convert to fraction form
    54.79/76.12 = 54.14/x
  3. Step 3: Cross multiply
    54.79x = 76.12 × 54.14
  4. Step 4: Simplify right side
    54.79x = 4,120.62
  5. Step 5: Solve for x
    x = 4,120.62/54.79
  6. Step 6: Final answer
    x = 75.21

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.