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Finding the Fourth Proportional to 70.22, 104.78 and 68.16

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Solution

The fourth proportional to 70.22, 104.78 and 68.16 is: 101.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.22 : 104.78 = 68.16 : x
  2. Step 2: Convert to fraction form
    70.22/104.78 = 68.16/x
  3. Step 3: Cross multiply
    70.22x = 104.78 × 68.16
  4. Step 4: Simplify right side
    70.22x = 7,141.80
  5. Step 5: Solve for x
    x = 7,141.80/70.22
  6. Step 6: Final answer
    x = 101.71

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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.