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Finding the Fourth Proportional to 29.09, 40.08 and 20.89

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Solution

The fourth proportional to 29.09, 40.08 and 20.89 is: 28.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.09 : 40.08 = 20.89 : x
  2. Step 2: Convert to fraction form
    29.09/40.08 = 20.89/x
  3. Step 3: Cross multiply
    29.09x = 40.08 × 20.89
  4. Step 4: Simplify right side
    29.09x = 836.97
  5. Step 5: Solve for x
    x = 836.97/29.09
  6. Step 6: Final answer
    x = 28.78

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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.