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Finding the Fourth Proportional to 70.88, 105.52 and 69.92

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Solution

The fourth proportional to 70.88, 105.52 and 69.92 is: 104.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.88 : 105.52 = 69.92 : x
  2. Step 2: Convert to fraction form
    70.88/105.52 = 69.92/x
  3. Step 3: Cross multiply
    70.88x = 105.52 × 69.92
  4. Step 4: Simplify right side
    70.88x = 7,377.96
  5. Step 5: Solve for x
    x = 7,377.96/70.88
  6. Step 6: Final answer
    x = 104.09

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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.