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Finding the Fourth Proportional to 171.43, 256.80 and 109.54

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Solution

The fourth proportional to 171.43, 256.80 and 109.54 is: 164.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.43 : 256.80 = 109.54 : x
  2. Step 2: Convert to fraction form
    171.43/256.80 = 109.54/x
  3. Step 3: Cross multiply
    171.43x = 256.80 × 109.54
  4. Step 4: Simplify right side
    171.43x = 28,129.87
  5. Step 5: Solve for x
    x = 28,129.87/171.43
  6. Step 6: Final answer
    x = 164.09

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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.