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Finding the Fourth Proportional to 428.02, 641.67 and 167.91

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Solution

The fourth proportional to 428.02, 641.67 and 167.91 is: 251.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.02 : 641.67 = 167.91 : x
  2. Step 2: Convert to fraction form
    428.02/641.67 = 167.91/x
  3. Step 3: Cross multiply
    428.02x = 641.67 × 167.91
  4. Step 4: Simplify right side
    428.02x = 107,742.81
  5. Step 5: Solve for x
    x = 107,742.81/428.02
  6. Step 6: Final answer
    x = 251.72

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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.