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Finding the Fourth Proportional to 171.31, 256.69 and 84.63

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Solution

The fourth proportional to 171.31, 256.69 and 84.63 is: 126.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.31 : 256.69 = 84.63 : x
  2. Step 2: Convert to fraction form
    171.31/256.69 = 84.63/x
  3. Step 3: Cross multiply
    171.31x = 256.69 × 84.63
  4. Step 4: Simplify right side
    171.31x = 21,723.67
  5. Step 5: Solve for x
    x = 21,723.67/171.31
  6. Step 6: Final answer
    x = 126.81

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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.