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Finding the Fourth Proportional to 29.70, 41.20 and 28.48

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Solution

The fourth proportional to 29.70, 41.20 and 28.48 is: 39.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.70 : 41.20 = 28.48 : x
  2. Step 2: Convert to fraction form
    29.70/41.20 = 28.48/x
  3. Step 3: Cross multiply
    29.70x = 41.20 × 28.48
  4. Step 4: Simplify right side
    29.70x = 1,173.38
  5. Step 5: Solve for x
    x = 1,173.38/29.70
  6. Step 6: Final answer
    x = 39.51

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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.