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Finding the Fourth Proportional to 77.64, 107.90 and 76.83

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Solution

The fourth proportional to 77.64, 107.90 and 76.83 is: 106.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.64 : 107.90 = 76.83 : x
  2. Step 2: Convert to fraction form
    77.64/107.90 = 76.83/x
  3. Step 3: Cross multiply
    77.64x = 107.90 × 76.83
  4. Step 4: Simplify right side
    77.64x = 8,289.96
  5. Step 5: Solve for x
    x = 8,289.96/77.64
  6. Step 6: Final answer
    x = 106.77

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.