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Finding the Fourth Proportional to 28.92, 39.96 and 21.68

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Solution

The fourth proportional to 28.92, 39.96 and 21.68 is: 29.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.92 : 39.96 = 21.68 : x
  2. Step 2: Convert to fraction form
    28.92/39.96 = 21.68/x
  3. Step 3: Cross multiply
    28.92x = 39.96 × 21.68
  4. Step 4: Simplify right side
    28.92x = 866.33
  5. Step 5: Solve for x
    x = 866.33/28.92
  6. Step 6: Final answer
    x = 29.96

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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.