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Finding the Fourth Proportional to 22.91, 31.74 and 21.56

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Solution

The fourth proportional to 22.91, 31.74 and 21.56 is: 29.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.91 : 31.74 = 21.56 : x
  2. Step 2: Convert to fraction form
    22.91/31.74 = 21.56/x
  3. Step 3: Cross multiply
    22.91x = 31.74 × 21.56
  4. Step 4: Simplify right side
    22.91x = 684.16
  5. Step 5: Solve for x
    x = 684.16/22.91
  6. Step 6: Final answer
    x = 29.87

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.