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Finding the Fourth Proportional to 69.70, 104.56 and 28.58

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Solution

The fourth proportional to 69.70, 104.56 and 28.58 is: 42.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.70 : 104.56 = 28.58 : x
  2. Step 2: Convert to fraction form
    69.70/104.56 = 28.58/x
  3. Step 3: Cross multiply
    69.70x = 104.56 × 28.58
  4. Step 4: Simplify right side
    69.70x = 2,988.32
  5. Step 5: Solve for x
    x = 2,988.32/69.70
  6. Step 6: Final answer
    x = 42.87

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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.