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Finding the Fourth Proportional to 70.67, 105.78 and 68.29

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Solution

The fourth proportional to 70.67, 105.78 and 68.29 is: 102.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.67 : 105.78 = 68.29 : x
  2. Step 2: Convert to fraction form
    70.67/105.78 = 68.29/x
  3. Step 3: Cross multiply
    70.67x = 105.78 × 68.29
  4. Step 4: Simplify right side
    70.67x = 7,223.72
  5. Step 5: Solve for x
    x = 7,223.72/70.67
  6. Step 6: Final answer
    x = 102.22

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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.