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Finding the Fourth Proportional to 171.21, 256.86 and 102.75

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Solution

The fourth proportional to 171.21, 256.86 and 102.75 is: 154.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.21 : 256.86 = 102.75 : x
  2. Step 2: Convert to fraction form
    171.21/256.86 = 102.75/x
  3. Step 3: Cross multiply
    171.21x = 256.86 × 102.75
  4. Step 4: Simplify right side
    171.21x = 26,392.37
  5. Step 5: Solve for x
    x = 26,392.37/171.21
  6. Step 6: Final answer
    x = 154.15

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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.