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Finding the Fourth Proportional to 793.20, 1,191.72 and 727.92

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Solution

The fourth proportional to 793.20, 1,191.72 and 727.92 is: 1,093.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.20 : 1,191.72 = 727.92 : x
  2. Step 2: Convert to fraction form
    793.20/1,191.72 = 727.92/x
  3. Step 3: Cross multiply
    793.20x = 1,191.72 × 727.92
  4. Step 4: Simplify right side
    793.20x = 867,476.82
  5. Step 5: Solve for x
    x = 867,476.82/793.20
  6. Step 6: Final answer
    x = 1,093.64

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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.