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Finding the Fourth Proportional to 77.80, 106.43 and 77.44

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Solution

The fourth proportional to 77.80, 106.43 and 77.44 is: 105.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.80 : 106.43 = 77.44 : x
  2. Step 2: Convert to fraction form
    77.80/106.43 = 77.44/x
  3. Step 3: Cross multiply
    77.80x = 106.43 × 77.44
  4. Step 4: Simplify right side
    77.80x = 8,241.94
  5. Step 5: Solve for x
    x = 8,241.94/77.80
  6. Step 6: Final answer
    x = 105.94

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.