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Finding the Fourth Proportional to 271.26, 406.80 and 76.21

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Solution

The fourth proportional to 271.26, 406.80 and 76.21 is: 114.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.26 : 406.80 = 76.21 : x
  2. Step 2: Convert to fraction form
    271.26/406.80 = 76.21/x
  3. Step 3: Cross multiply
    271.26x = 406.80 × 76.21
  4. Step 4: Simplify right side
    271.26x = 31,002.23
  5. Step 5: Solve for x
    x = 31,002.23/271.26
  6. Step 6: Final answer
    x = 114.29

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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.