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Finding the Fourth Proportional to 28.49, 42.69 and 19.91

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Solution

The fourth proportional to 28.49, 42.69 and 19.91 is: 29.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.49 : 42.69 = 19.91 : x
  2. Step 2: Convert to fraction form
    28.49/42.69 = 19.91/x
  3. Step 3: Cross multiply
    28.49x = 42.69 × 19.91
  4. Step 4: Simplify right side
    28.49x = 849.97
  5. Step 5: Solve for x
    x = 849.97/28.49
  6. Step 6: Final answer
    x = 29.83

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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.