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Finding the Fourth Proportional to 77.79, 107.30 and 54.44

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Solution

The fourth proportional to 77.79, 107.30 and 54.44 is: 75.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.79 : 107.30 = 54.44 : x
  2. Step 2: Convert to fraction form
    77.79/107.30 = 54.44/x
  3. Step 3: Cross multiply
    77.79x = 107.30 × 54.44
  4. Step 4: Simplify right side
    77.79x = 5,841.82
  5. Step 5: Solve for x
    x = 5,841.82/77.79
  6. Step 6: Final answer
    x = 75.10

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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.