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Finding the Fourth Proportional to 29.79, 41.09 and 20.61

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Solution

The fourth proportional to 29.79, 41.09 and 20.61 is: 28.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.79 : 41.09 = 20.61 : x
  2. Step 2: Convert to fraction form
    29.79/41.09 = 20.61/x
  3. Step 3: Cross multiply
    29.79x = 41.09 × 20.61
  4. Step 4: Simplify right side
    29.79x = 846.76
  5. Step 5: Solve for x
    x = 846.76/29.79
  6. Step 6: Final answer
    x = 28.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.