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Finding the Fourth Proportional to 216.09, 298.17 and 122.78

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Solution

The fourth proportional to 216.09, 298.17 and 122.78 is: 169.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.09 : 298.17 = 122.78 : x
  2. Step 2: Convert to fraction form
    216.09/298.17 = 122.78/x
  3. Step 3: Cross multiply
    216.09x = 298.17 × 122.78
  4. Step 4: Simplify right side
    216.09x = 36,610.06
  5. Step 5: Solve for x
    x = 36,610.06/216.09
  6. Step 6: Final answer
    x = 169.42

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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.