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Finding the Fourth Proportional to 427.66, 641.44 and 167.85

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Solution

The fourth proportional to 427.66, 641.44 and 167.85 is: 251.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.66 : 641.44 = 167.85 : x
  2. Step 2: Convert to fraction form
    427.66/641.44 = 167.85/x
  3. Step 3: Cross multiply
    427.66x = 641.44 × 167.85
  4. Step 4: Simplify right side
    427.66x = 107,664.97
  5. Step 5: Solve for x
    x = 107,664.97/427.66
  6. Step 6: Final answer
    x = 251.76

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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.