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Finding the Fourth Proportional to 793.43, 1,187.70 and 620.60

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Solution

The fourth proportional to 793.43, 1,187.70 and 620.60 is: 928.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.43 : 1,187.70 = 620.60 : x
  2. Step 2: Convert to fraction form
    793.43/1,187.70 = 620.60/x
  3. Step 3: Cross multiply
    793.43x = 1,187.70 × 620.60
  4. Step 4: Simplify right side
    793.43x = 737,086.62
  5. Step 5: Solve for x
    x = 737,086.62/793.43
  6. Step 6: Final answer
    x = 928.99

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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.