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Finding the Fourth Proportional to 70.73, 106.64 and 69.96

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Solution

The fourth proportional to 70.73, 106.64 and 69.96 is: 105.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.73 : 106.64 = 69.96 : x
  2. Step 2: Convert to fraction form
    70.73/106.64 = 69.96/x
  3. Step 3: Cross multiply
    70.73x = 106.64 × 69.96
  4. Step 4: Simplify right side
    70.73x = 7,460.18
  5. Step 5: Solve for x
    x = 7,460.18/70.73
  6. Step 6: Final answer
    x = 105.48

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.