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Finding the Fourth Proportional to 70.82, 106.84 and 68.70

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Solution

The fourth proportional to 70.82, 106.84 and 68.70 is: 103.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.82 : 106.84 = 68.70 : x
  2. Step 2: Convert to fraction form
    70.82/106.84 = 68.70/x
  3. Step 3: Cross multiply
    70.82x = 106.84 × 68.70
  4. Step 4: Simplify right side
    70.82x = 7,339.74
  5. Step 5: Solve for x
    x = 7,339.74/70.82
  6. Step 6: Final answer
    x = 103.65

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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.