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Finding the Fourth Proportional to 33.12, 45.60 and 28.74

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Solution

The fourth proportional to 33.12, 45.60 and 28.74 is: 39.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.12 : 45.60 = 28.74 : x
  2. Step 2: Convert to fraction form
    33.12/45.60 = 28.74/x
  3. Step 3: Cross multiply
    33.12x = 45.60 × 28.74
  4. Step 4: Simplify right side
    33.12x = 1,310.54
  5. Step 5: Solve for x
    x = 1,310.54/33.12
  6. Step 6: Final answer
    x = 39.57

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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.