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Finding the Fourth Proportional to 69.34, 104.05 and 28.76

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Solution

The fourth proportional to 69.34, 104.05 and 28.76 is: 43.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.34 : 104.05 = 28.76 : x
  2. Step 2: Convert to fraction form
    69.34/104.05 = 28.76/x
  3. Step 3: Cross multiply
    69.34x = 104.05 × 28.76
  4. Step 4: Simplify right side
    69.34x = 2,992.48
  5. Step 5: Solve for x
    x = 2,992.48/69.34
  6. Step 6: Final answer
    x = 43.16

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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.