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Finding the Fourth Proportional to 76.12, 105.07 and 68.34

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Solution

The fourth proportional to 76.12, 105.07 and 68.34 is: 94.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.12 : 105.07 = 68.34 : x
  2. Step 2: Convert to fraction form
    76.12/105.07 = 68.34/x
  3. Step 3: Cross multiply
    76.12x = 105.07 × 68.34
  4. Step 4: Simplify right side
    76.12x = 7,180.48
  5. Step 5: Solve for x
    x = 7,180.48/76.12
  6. Step 6: Final answer
    x = 94.33

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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.