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Finding the Fourth Proportional to 29.36, 40.56 and 20.78

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Solution

The fourth proportional to 29.36, 40.56 and 20.78 is: 28.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.36 : 40.56 = 20.78 : x
  2. Step 2: Convert to fraction form
    29.36/40.56 = 20.78/x
  3. Step 3: Cross multiply
    29.36x = 40.56 × 20.78
  4. Step 4: Simplify right side
    29.36x = 842.84
  5. Step 5: Solve for x
    x = 842.84/29.36
  6. Step 6: Final answer
    x = 28.71

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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.