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Finding the Fourth Proportional to 54.36, 74.95 and 38.79

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Solution

The fourth proportional to 54.36, 74.95 and 38.79 is: 53.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.36 : 74.95 = 38.79 : x
  2. Step 2: Convert to fraction form
    54.36/74.95 = 38.79/x
  3. Step 3: Cross multiply
    54.36x = 74.95 × 38.79
  4. Step 4: Simplify right side
    54.36x = 2,907.21
  5. Step 5: Solve for x
    x = 2,907.21/54.36
  6. Step 6: Final answer
    x = 53.48

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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.