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Finding the Fourth Proportional to 216.12, 298.26 and 122.86

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Solution

The fourth proportional to 216.12, 298.26 and 122.86 is: 169.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.12 : 298.26 = 122.86 : x
  2. Step 2: Convert to fraction form
    216.12/298.26 = 122.86/x
  3. Step 3: Cross multiply
    216.12x = 298.26 × 122.86
  4. Step 4: Simplify right side
    216.12x = 36,643.48
  5. Step 5: Solve for x
    x = 36,643.48/216.12
  6. Step 6: Final answer
    x = 169.55

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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.