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Finding the Fourth Proportional to 54.91, 75.78 and 36.49

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Solution

The fourth proportional to 54.91, 75.78 and 36.49 is: 50.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.91 : 75.78 = 36.49 : x
  2. Step 2: Convert to fraction form
    54.91/75.78 = 36.49/x
  3. Step 3: Cross multiply
    54.91x = 75.78 × 36.49
  4. Step 4: Simplify right side
    54.91x = 2,765.21
  5. Step 5: Solve for x
    x = 2,765.21/54.91
  6. Step 6: Final answer
    x = 50.36

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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.