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Finding the Fourth Proportional to 171.21, 255.27 and 145.68

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Solution

The fourth proportional to 171.21, 255.27 and 145.68 is: 217.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.21 : 255.27 = 145.68 : x
  2. Step 2: Convert to fraction form
    171.21/255.27 = 145.68/x
  3. Step 3: Cross multiply
    171.21x = 255.27 × 145.68
  4. Step 4: Simplify right side
    171.21x = 37,187.73
  5. Step 5: Solve for x
    x = 37,187.73/171.21
  6. Step 6: Final answer
    x = 217.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.