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Finding the Fourth Proportional to 427.97, 641.27 and 281.42

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Solution

The fourth proportional to 427.97, 641.27 and 281.42 is: 421.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.97 : 641.27 = 281.42 : x
  2. Step 2: Convert to fraction form
    427.97/641.27 = 281.42/x
  3. Step 3: Cross multiply
    427.97x = 641.27 × 281.42
  4. Step 4: Simplify right side
    427.97x = 180,461.59
  5. Step 5: Solve for x
    x = 180,461.59/427.97
  6. Step 6: Final answer
    x = 421.67

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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.