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Finding the Fourth Proportional to 29.82, 40.91 and 28.65

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Solution

The fourth proportional to 29.82, 40.91 and 28.65 is: 39.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.82 : 40.91 = 28.65 : x
  2. Step 2: Convert to fraction form
    29.82/40.91 = 28.65/x
  3. Step 3: Cross multiply
    29.82x = 40.91 × 28.65
  4. Step 4: Simplify right side
    29.82x = 1,171.93
  5. Step 5: Solve for x
    x = 1,171.93/29.82
  6. Step 6: Final answer
    x = 39.30

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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.