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Finding the Fourth Proportional to 105.27, 157.44 and 82.18

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Solution

The fourth proportional to 105.27, 157.44 and 82.18 is: 122.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.27 : 157.44 = 82.18 : x
  2. Step 2: Convert to fraction form
    105.27/157.44 = 82.18/x
  3. Step 3: Cross multiply
    105.27x = 157.44 × 82.18
  4. Step 4: Simplify right side
    105.27x = 12,938.42
  5. Step 5: Solve for x
    x = 12,938.42/105.27
  6. Step 6: Final answer
    x = 122.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.