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Finding the Fourth Proportional to 30.27, 41.49 and 28.80

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Solution

The fourth proportional to 30.27, 41.49 and 28.80 is: 39.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.27 : 41.49 = 28.80 : x
  2. Step 2: Convert to fraction form
    30.27/41.49 = 28.80/x
  3. Step 3: Cross multiply
    30.27x = 41.49 × 28.80
  4. Step 4: Simplify right side
    30.27x = 1,194.91
  5. Step 5: Solve for x
    x = 1,194.91/30.27
  6. Step 6: Final answer
    x = 39.48

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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.