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Finding the Fourth Proportional to 793.22, 1,188.20 and 638.31

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Solution

The fourth proportional to 793.22, 1,188.20 and 638.31 is: 956.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.22 : 1,188.20 = 638.31 : x
  2. Step 2: Convert to fraction form
    793.22/1,188.20 = 638.31/x
  3. Step 3: Cross multiply
    793.22x = 1,188.20 × 638.31
  4. Step 4: Simplify right side
    793.22x = 758,439.94
  5. Step 5: Solve for x
    x = 758,439.94/793.22
  6. Step 6: Final answer
    x = 956.15

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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.