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Finding the Fourth Proportional to 428.02, 641.33 and 167.73

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Solution

The fourth proportional to 428.02, 641.33 and 167.73 is: 251.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.02 : 641.33 = 167.73 : x
  2. Step 2: Convert to fraction form
    428.02/641.33 = 167.73/x
  3. Step 3: Cross multiply
    428.02x = 641.33 × 167.73
  4. Step 4: Simplify right side
    428.02x = 107,570.28
  5. Step 5: Solve for x
    x = 107,570.28/428.02
  6. Step 6: Final answer
    x = 251.32

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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.