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Finding the Fourth Proportional to 28.79, 42.99 and 22.71

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Solution

The fourth proportional to 28.79, 42.99 and 22.71 is: 33.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.79 : 42.99 = 22.71 : x
  2. Step 2: Convert to fraction form
    28.79/42.99 = 22.71/x
  3. Step 3: Cross multiply
    28.79x = 42.99 × 22.71
  4. Step 4: Simplify right side
    28.79x = 976.30
  5. Step 5: Solve for x
    x = 976.30/28.79
  6. Step 6: Final answer
    x = 33.91

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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.