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Finding the Fourth Proportional to 29.76, 41.24 and 28.64

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Solution

The fourth proportional to 29.76, 41.24 and 28.64 is: 39.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.76 : 41.24 = 28.64 : x
  2. Step 2: Convert to fraction form
    29.76/41.24 = 28.64/x
  3. Step 3: Cross multiply
    29.76x = 41.24 × 28.64
  4. Step 4: Simplify right side
    29.76x = 1,181.11
  5. Step 5: Solve for x
    x = 1,181.11/29.76
  6. Step 6: Final answer
    x = 39.69

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.