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Finding the Fourth Proportional to 29.01, 39.99 and 20.81

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Solution

The fourth proportional to 29.01, 39.99 and 20.81 is: 28.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.01 : 39.99 = 20.81 : x
  2. Step 2: Convert to fraction form
    29.01/39.99 = 20.81/x
  3. Step 3: Cross multiply
    29.01x = 39.99 × 20.81
  4. Step 4: Simplify right side
    29.01x = 832.14
  5. Step 5: Solve for x
    x = 832.14/29.01
  6. Step 6: Final answer
    x = 28.69

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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.