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Finding the Fourth Proportional to 216.45, 298.68 and 121.92

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Solution

The fourth proportional to 216.45, 298.68 and 121.92 is: 168.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.45 : 298.68 = 121.92 : x
  2. Step 2: Convert to fraction form
    216.45/298.68 = 121.92/x
  3. Step 3: Cross multiply
    216.45x = 298.68 × 121.92
  4. Step 4: Simplify right side
    216.45x = 36,415.07
  5. Step 5: Solve for x
    x = 36,415.07/216.45
  6. Step 6: Final answer
    x = 168.24

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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.