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Finding the Fourth Proportional to 427.88, 641.79 and 167.94

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Solution

The fourth proportional to 427.88, 641.79 and 167.94 is: 251.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.88 : 641.79 = 167.94 : x
  2. Step 2: Convert to fraction form
    427.88/641.79 = 167.94/x
  3. Step 3: Cross multiply
    427.88x = 641.79 × 167.94
  4. Step 4: Simplify right side
    427.88x = 107,782.21
  5. Step 5: Solve for x
    x = 107,782.21/427.88
  6. Step 6: Final answer
    x = 251.90

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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.