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Finding the Fourth Proportional to 789.78, 1,184.70 and 327.60

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Solution

The fourth proportional to 789.78, 1,184.70 and 327.60 is: 491.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.78 : 1,184.70 = 327.60 : x
  2. Step 2: Convert to fraction form
    789.78/1,184.70 = 327.60/x
  3. Step 3: Cross multiply
    789.78x = 1,184.70 × 327.60
  4. Step 4: Simplify right side
    789.78x = 388,107.72
  5. Step 5: Solve for x
    x = 388,107.72/789.78
  6. Step 6: Final answer
    x = 491.41

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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.