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Finding the Fourth Proportional to 77.97, 117 and 68.43

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Solution

The fourth proportional to 77.97, 117 and 68.43 is: 102.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.97 : 117 = 68.43 : x
  2. Step 2: Convert to fraction form
    77.97/117 = 68.43/x
  3. Step 3: Cross multiply
    77.97x = 117 × 68.43
  4. Step 4: Simplify right side
    77.97x = 8,006.31
  5. Step 5: Solve for x
    x = 8,006.31/77.97
  6. Step 6: Final answer
    x = 102.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.