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Finding the Fourth Proportional to 22.81, 31.54 and 21.86

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Solution

The fourth proportional to 22.81, 31.54 and 21.86 is: 30.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.81 : 31.54 = 21.86 : x
  2. Step 2: Convert to fraction form
    22.81/31.54 = 21.86/x
  3. Step 3: Cross multiply
    22.81x = 31.54 × 21.86
  4. Step 4: Simplify right side
    22.81x = 689.33
  5. Step 5: Solve for x
    x = 689.33/22.81
  6. Step 6: Final answer
    x = 30.22

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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.