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Finding the Fourth Proportional to 22.42, 30.91 and 15.86

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Solution

The fourth proportional to 22.42, 30.91 and 15.86 is: 21.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.42 : 30.91 = 15.86 : x
  2. Step 2: Convert to fraction form
    22.42/30.91 = 15.86/x
  3. Step 3: Cross multiply
    22.42x = 30.91 × 15.86
  4. Step 4: Simplify right side
    22.42x = 490.23
  5. Step 5: Solve for x
    x = 490.23/22.42
  6. Step 6: Final answer
    x = 21.87

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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.