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Finding the Fourth Proportional to 77.70, 107.21 and 54.44

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Solution

The fourth proportional to 77.70, 107.21 and 54.44 is: 75.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.70 : 107.21 = 54.44 : x
  2. Step 2: Convert to fraction form
    77.70/107.21 = 54.44/x
  3. Step 3: Cross multiply
    77.70x = 107.21 × 54.44
  4. Step 4: Simplify right side
    77.70x = 5,836.51
  5. Step 5: Solve for x
    x = 5,836.51/77.70
  6. Step 6: Final answer
    x = 75.11

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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.