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Finding the Fourth Proportional to 793.21, 1,189.76 and 422.44

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Solution

The fourth proportional to 793.21, 1,189.76 and 422.44 is: 633.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.21 : 1,189.76 = 422.44 : x
  2. Step 2: Convert to fraction form
    793.21/1,189.76 = 422.44/x
  3. Step 3: Cross multiply
    793.21x = 1,189.76 × 422.44
  4. Step 4: Simplify right side
    793.21x = 502,596.27
  5. Step 5: Solve for x
    x = 502,596.27/793.21
  6. Step 6: Final answer
    x = 633.63

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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.