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Finding the Fourth Proportional to 937.70, 1,406.78 and 321.44

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Solution

The fourth proportional to 937.70, 1,406.78 and 321.44 is: 482.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.70 : 1,406.78 = 321.44 : x
  2. Step 2: Convert to fraction form
    937.70/1,406.78 = 321.44/x
  3. Step 3: Cross multiply
    937.70x = 1,406.78 × 321.44
  4. Step 4: Simplify right side
    937.70x = 452,189.13
  5. Step 5: Solve for x
    x = 452,189.13/937.70
  6. Step 6: Final answer
    x = 482.23

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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.