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Finding the Fourth Proportional to 28.92, 43.20 and 21.26

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Solution

The fourth proportional to 28.92, 43.20 and 21.26 is: 31.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.92 : 43.20 = 21.26 : x
  2. Step 2: Convert to fraction form
    28.92/43.20 = 21.26/x
  3. Step 3: Cross multiply
    28.92x = 43.20 × 21.26
  4. Step 4: Simplify right side
    28.92x = 918.43
  5. Step 5: Solve for x
    x = 918.43/28.92
  6. Step 6: Final answer
    x = 31.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.