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Finding the Fourth Proportional to 69.92, 104.22 and 68.70

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Solution

The fourth proportional to 69.92, 104.22 and 68.70 is: 102.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.92 : 104.22 = 68.70 : x
  2. Step 2: Convert to fraction form
    69.92/104.22 = 68.70/x
  3. Step 3: Cross multiply
    69.92x = 104.22 × 68.70
  4. Step 4: Simplify right side
    69.92x = 7,159.91
  5. Step 5: Solve for x
    x = 7,159.91/69.92
  6. Step 6: Final answer
    x = 102.40

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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.