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Finding the Fourth Proportional to 76.92, 114.69 and 68.36

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Solution

The fourth proportional to 76.92, 114.69 and 68.36 is: 101.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.92 : 114.69 = 68.36 : x
  2. Step 2: Convert to fraction form
    76.92/114.69 = 68.36/x
  3. Step 3: Cross multiply
    76.92x = 114.69 × 68.36
  4. Step 4: Simplify right side
    76.92x = 7,840.21
  5. Step 5: Solve for x
    x = 7,840.21/76.92
  6. Step 6: Final answer
    x = 101.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.