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Finding the Fourth Proportional to 54.90, 81.92 and 49.77

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Solution

The fourth proportional to 54.90, 81.92 and 49.77 is: 74.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.90 : 81.92 = 49.77 : x
  2. Step 2: Convert to fraction form
    54.90/81.92 = 49.77/x
  3. Step 3: Cross multiply
    54.90x = 81.92 × 49.77
  4. Step 4: Simplify right side
    54.90x = 4,077.28
  5. Step 5: Solve for x
    x = 4,077.28/54.90
  6. Step 6: Final answer
    x = 74.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.