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Finding the Fourth Proportional to 171.05, 256.85 and 102.88

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Solution

The fourth proportional to 171.05, 256.85 and 102.88 is: 154.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.05 : 256.85 = 102.88 : x
  2. Step 2: Convert to fraction form
    171.05/256.85 = 102.88/x
  3. Step 3: Cross multiply
    171.05x = 256.85 × 102.88
  4. Step 4: Simplify right side
    171.05x = 26,423.57
  5. Step 5: Solve for x
    x = 26,423.57/171.05
  6. Step 6: Final answer
    x = 154.48

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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.