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Finding the Fourth Proportional to 793.90, 1,190.40 and 403.78

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Solution

The fourth proportional to 793.90, 1,190.40 and 403.78 is: 605.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.90 : 1,190.40 = 403.78 : x
  2. Step 2: Convert to fraction form
    793.90/1,190.40 = 403.78/x
  3. Step 3: Cross multiply
    793.90x = 1,190.40 × 403.78
  4. Step 4: Simplify right side
    793.90x = 480,659.71
  5. Step 5: Solve for x
    x = 480,659.71/793.90
  6. Step 6: Final answer
    x = 605.44

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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.