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Finding the Fourth Proportional to 427.37, 640.80 and 167.19

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Solution

The fourth proportional to 427.37, 640.80 and 167.19 is: 250.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.37 : 640.80 = 167.19 : x
  2. Step 2: Convert to fraction form
    427.37/640.80 = 167.19/x
  3. Step 3: Cross multiply
    427.37x = 640.80 × 167.19
  4. Step 4: Simplify right side
    427.37x = 107,135.35
  5. Step 5: Solve for x
    x = 107,135.35/427.37
  6. Step 6: Final answer
    x = 250.69

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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.