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Finding the Fourth Proportional to 77.69, 107.12 and 67.83

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Solution

The fourth proportional to 77.69, 107.12 and 67.83 is: 93.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.69 : 107.12 = 67.83 : x
  2. Step 2: Convert to fraction form
    77.69/107.12 = 67.83/x
  3. Step 3: Cross multiply
    77.69x = 107.12 × 67.83
  4. Step 4: Simplify right side
    77.69x = 7,265.72
  5. Step 5: Solve for x
    x = 7,265.72/77.69
  6. Step 6: Final answer
    x = 93.52

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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.