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Finding the Fourth Proportional to 70.82, 106.06 and 69.09

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Solution

The fourth proportional to 70.82, 106.06 and 69.09 is: 103.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.82 : 106.06 = 69.09 : x
  2. Step 2: Convert to fraction form
    70.82/106.06 = 69.09/x
  3. Step 3: Cross multiply
    70.82x = 106.06 × 69.09
  4. Step 4: Simplify right side
    70.82x = 7,327.69
  5. Step 5: Solve for x
    x = 7,327.69/70.82
  6. Step 6: Final answer
    x = 103.47

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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.