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Finding the Fourth Proportional to 321.07, 481.40 and 164.80

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Solution

The fourth proportional to 321.07, 481.40 and 164.80 is: 247.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.07 : 481.40 = 164.80 : x
  2. Step 2: Convert to fraction form
    321.07/481.40 = 164.80/x
  3. Step 3: Cross multiply
    321.07x = 481.40 × 164.80
  4. Step 4: Simplify right side
    321.07x = 79,334.72
  5. Step 5: Solve for x
    x = 79,334.72/321.07
  6. Step 6: Final answer
    x = 247.09

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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.