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Finding the Fourth Proportional to 217.74, 326.62 and 153.90

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Solution

The fourth proportional to 217.74, 326.62 and 153.90 is: 230.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.74 : 326.62 = 153.90 : x
  2. Step 2: Convert to fraction form
    217.74/326.62 = 153.90/x
  3. Step 3: Cross multiply
    217.74x = 326.62 × 153.90
  4. Step 4: Simplify right side
    217.74x = 50,266.82
  5. Step 5: Solve for x
    x = 50,266.82/217.74
  6. Step 6: Final answer
    x = 230.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.