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Finding the Fourth Proportional to 216.11, 298.27 and 122.90

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Solution

The fourth proportional to 216.11, 298.27 and 122.90 is: 169.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.11 : 298.27 = 122.90 : x
  2. Step 2: Convert to fraction form
    216.11/298.27 = 122.90/x
  3. Step 3: Cross multiply
    216.11x = 298.27 × 122.90
  4. Step 4: Simplify right side
    216.11x = 36,655.28
  5. Step 5: Solve for x
    x = 36,655.28/216.11
  6. Step 6: Final answer
    x = 169.61

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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.