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Finding the Fourth Proportional to 427.37, 640.28 and 381.26

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Solution

The fourth proportional to 427.37, 640.28 and 381.26 is: 571.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.37 : 640.28 = 381.26 : x
  2. Step 2: Convert to fraction form
    427.37/640.28 = 381.26/x
  3. Step 3: Cross multiply
    427.37x = 640.28 × 381.26
  4. Step 4: Simplify right side
    427.37x = 244,108.05
  5. Step 5: Solve for x
    x = 244,108.05/427.37
  6. Step 6: Final answer
    x = 571.18

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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.