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Finding the Fourth Proportional to 427.40, 640.96 and 167.39

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Solution

The fourth proportional to 427.40, 640.96 and 167.39 is: 251.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.40 : 640.96 = 167.39 : x
  2. Step 2: Convert to fraction form
    427.40/640.96 = 167.39/x
  3. Step 3: Cross multiply
    427.40x = 640.96 × 167.39
  4. Step 4: Simplify right side
    427.40x = 107,290.29
  5. Step 5: Solve for x
    x = 107,290.29/427.40
  6. Step 6: Final answer
    x = 251.03

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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.