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Finding the Fourth Proportional to 791.92, 1,188.80 and 788.40

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Solution

The fourth proportional to 791.92, 1,188.80 and 788.40 is: 1,183.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.92 : 1,188.80 = 788.40 : x
  2. Step 2: Convert to fraction form
    791.92/1,188.80 = 788.40/x
  3. Step 3: Cross multiply
    791.92x = 1,188.80 × 788.40
  4. Step 4: Simplify right side
    791.92x = 937,249.92
  5. Step 5: Solve for x
    x = 937,249.92/791.92
  6. Step 6: Final answer
    x = 1,183.52

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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.