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Finding the Fourth Proportional to 216.10, 298.20 and 121.57

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Solution

The fourth proportional to 216.10, 298.20 and 121.57 is: 167.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.10 : 298.20 = 121.57 : x
  2. Step 2: Convert to fraction form
    216.10/298.20 = 121.57/x
  3. Step 3: Cross multiply
    216.10x = 298.20 × 121.57
  4. Step 4: Simplify right side
    216.10x = 36,251.88
  5. Step 5: Solve for x
    x = 36,251.88/216.10
  6. Step 6: Final answer
    x = 167.75

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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.