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Finding the Fourth Proportional to 937.36, 1,405.79 and 321.20

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Solution

The fourth proportional to 937.36, 1,405.79 and 321.20 is: 481.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.36 : 1,405.79 = 321.20 : x
  2. Step 2: Convert to fraction form
    937.36/1,405.79 = 321.20/x
  3. Step 3: Cross multiply
    937.36x = 1,405.79 × 321.20
  4. Step 4: Simplify right side
    937.36x = 451,539.75
  5. Step 5: Solve for x
    x = 451,539.75/937.36
  6. Step 6: Final answer
    x = 481.71

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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.