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Finding the Fourth Proportional to 70.05, 105.06 and 68.61

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Solution

The fourth proportional to 70.05, 105.06 and 68.61 is: 102.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.05 : 105.06 = 68.61 : x
  2. Step 2: Convert to fraction form
    70.05/105.06 = 68.61/x
  3. Step 3: Cross multiply
    70.05x = 105.06 × 68.61
  4. Step 4: Simplify right side
    70.05x = 7,208.17
  5. Step 5: Solve for x
    x = 7,208.17/70.05
  6. Step 6: Final answer
    x = 102.90

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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.