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Finding the Fourth Proportional to 29.43, 40.38 and 29.09

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Solution

The fourth proportional to 29.43, 40.38 and 29.09 is: 39.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.43 : 40.38 = 29.09 : x
  2. Step 2: Convert to fraction form
    29.43/40.38 = 29.09/x
  3. Step 3: Cross multiply
    29.43x = 40.38 × 29.09
  4. Step 4: Simplify right side
    29.43x = 1,174.65
  5. Step 5: Solve for x
    x = 1,174.65/29.43
  6. Step 6: Final answer
    x = 39.91

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.