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Finding the Fourth Proportional to 28.92, 39.72 and 27.96

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Solution

The fourth proportional to 28.92, 39.72 and 27.96 is: 38.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.92 : 39.72 = 27.96 : x
  2. Step 2: Convert to fraction form
    28.92/39.72 = 27.96/x
  3. Step 3: Cross multiply
    28.92x = 39.72 × 27.96
  4. Step 4: Simplify right side
    28.92x = 1,110.57
  5. Step 5: Solve for x
    x = 1,110.57/28.92
  6. Step 6: Final answer
    x = 38.40

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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.