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Finding the Fourth Proportional to 30.33, 41.91 and 28.66

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Solution

The fourth proportional to 30.33, 41.91 and 28.66 is: 39.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.33 : 41.91 = 28.66 : x
  2. Step 2: Convert to fraction form
    30.33/41.91 = 28.66/x
  3. Step 3: Cross multiply
    30.33x = 41.91 × 28.66
  4. Step 4: Simplify right side
    30.33x = 1,201.14
  5. Step 5: Solve for x
    x = 1,201.14/30.33
  6. Step 6: Final answer
    x = 39.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.