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Finding the Fourth Proportional to 321.26, 481.89 and 128.75

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Solution

The fourth proportional to 321.26, 481.89 and 128.75 is: 193.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.26 : 481.89 = 128.75 : x
  2. Step 2: Convert to fraction form
    321.26/481.89 = 128.75/x
  3. Step 3: Cross multiply
    321.26x = 481.89 × 128.75
  4. Step 4: Simplify right side
    321.26x = 62,043.34
  5. Step 5: Solve for x
    x = 62,043.34/321.26
  6. Step 6: Final answer
    x = 193.13

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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.