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Finding the Fourth Proportional to 427.21, 640.84 and 149.57

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Solution

The fourth proportional to 427.21, 640.84 and 149.57 is: 224.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.21 : 640.84 = 149.57 : x
  2. Step 2: Convert to fraction form
    427.21/640.84 = 149.57/x
  3. Step 3: Cross multiply
    427.21x = 640.84 × 149.57
  4. Step 4: Simplify right side
    427.21x = 95,850.44
  5. Step 5: Solve for x
    x = 95,850.44/427.21
  6. Step 6: Final answer
    x = 224.36

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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.