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Finding the Fourth Proportional to 20.74, 30.91 and 19.54

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Solution

The fourth proportional to 20.74, 30.91 and 19.54 is: 29.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.74 : 30.91 = 19.54 : x
  2. Step 2: Convert to fraction form
    20.74/30.91 = 19.54/x
  3. Step 3: Cross multiply
    20.74x = 30.91 × 19.54
  4. Step 4: Simplify right side
    20.74x = 603.88
  5. Step 5: Solve for x
    x = 603.88/20.74
  6. Step 6: Final answer
    x = 29.12

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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.