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Finding the Fourth Proportional to 217.21, 299.42 and 154.93

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Solution

The fourth proportional to 217.21, 299.42 and 154.93 is: 213.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.21 : 299.42 = 154.93 : x
  2. Step 2: Convert to fraction form
    217.21/299.42 = 154.93/x
  3. Step 3: Cross multiply
    217.21x = 299.42 × 154.93
  4. Step 4: Simplify right side
    217.21x = 46,388.37
  5. Step 5: Solve for x
    x = 46,388.37/217.21
  6. Step 6: Final answer
    x = 213.56

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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.