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Finding the Fourth Proportional to 69.43, 104.15 and 28.90

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Solution

The fourth proportional to 69.43, 104.15 and 28.90 is: 43.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.43 : 104.15 = 28.90 : x
  2. Step 2: Convert to fraction form
    69.43/104.15 = 28.90/x
  3. Step 3: Cross multiply
    69.43x = 104.15 × 28.90
  4. Step 4: Simplify right side
    69.43x = 3,009.94
  5. Step 5: Solve for x
    x = 3,009.94/69.43
  6. Step 6: Final answer
    x = 43.35

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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.