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Finding the Fourth Proportional to 427.54, 641.52 and 254.20

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Solution

The fourth proportional to 427.54, 641.52 and 254.20 is: 381.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.54 : 641.52 = 254.20 : x
  2. Step 2: Convert to fraction form
    427.54/641.52 = 254.20/x
  3. Step 3: Cross multiply
    427.54x = 641.52 × 254.20
  4. Step 4: Simplify right side
    427.54x = 163,074.38
  5. Step 5: Solve for x
    x = 163,074.38/427.54
  6. Step 6: Final answer
    x = 381.42

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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.