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Finding the Fourth Proportional to 22.89, 31.38 and 21.95

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Solution

The fourth proportional to 22.89, 31.38 and 21.95 is: 30.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.89 : 31.38 = 21.95 : x
  2. Step 2: Convert to fraction form
    22.89/31.38 = 21.95/x
  3. Step 3: Cross multiply
    22.89x = 31.38 × 21.95
  4. Step 4: Simplify right side
    22.89x = 688.79
  5. Step 5: Solve for x
    x = 688.79/22.89
  6. Step 6: Final answer
    x = 30.09

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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.