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Finding the Fourth Proportional to 216.11, 298.25 and 122.87

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Solution

The fourth proportional to 216.11, 298.25 and 122.87 is: 169.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.11 : 298.25 = 122.87 : x
  2. Step 2: Convert to fraction form
    216.11/298.25 = 122.87/x
  3. Step 3: Cross multiply
    216.11x = 298.25 × 122.87
  4. Step 4: Simplify right side
    216.11x = 36,643.87
  5. Step 5: Solve for x
    x = 36,643.87/216.11
  6. Step 6: Final answer
    x = 169.57

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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.