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Finding the Fourth Proportional to 427.33, 642.20 and 254.03

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Solution

The fourth proportional to 427.33, 642.20 and 254.03 is: 381.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.33 : 642.20 = 254.03 : x
  2. Step 2: Convert to fraction form
    427.33/642.20 = 254.03/x
  3. Step 3: Cross multiply
    427.33x = 642.20 × 254.03
  4. Step 4: Simplify right side
    427.33x = 163,137.79
  5. Step 5: Solve for x
    x = 163,137.79/427.33
  6. Step 6: Final answer
    x = 381.76

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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.