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Finding the Fourth Proportional to 171.43, 257.79 and 136.80

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Solution

The fourth proportional to 171.43, 257.79 and 136.80 is: 205.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.43 : 257.79 = 136.80 : x
  2. Step 2: Convert to fraction form
    171.43/257.79 = 136.80/x
  3. Step 3: Cross multiply
    171.43x = 257.79 × 136.80
  4. Step 4: Simplify right side
    171.43x = 35,265.67
  5. Step 5: Solve for x
    x = 35,265.67/171.43
  6. Step 6: Final answer
    x = 205.71

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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.