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Finding the Fourth Proportional to 54.87, 75.69 and 38.49

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Solution

The fourth proportional to 54.87, 75.69 and 38.49 is: 53.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.87 : 75.69 = 38.49 : x
  2. Step 2: Convert to fraction form
    54.87/75.69 = 38.49/x
  3. Step 3: Cross multiply
    54.87x = 75.69 × 38.49
  4. Step 4: Simplify right side
    54.87x = 2,913.31
  5. Step 5: Solve for x
    x = 2,913.31/54.87
  6. Step 6: Final answer
    x = 53.09

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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.