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Finding the Fourth Proportional to 793.40, 1,189.07 and 330.65

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Solution

The fourth proportional to 793.40, 1,189.07 and 330.65 is: 495.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.40 : 1,189.07 = 330.65 : x
  2. Step 2: Convert to fraction form
    793.40/1,189.07 = 330.65/x
  3. Step 3: Cross multiply
    793.40x = 1,189.07 × 330.65
  4. Step 4: Simplify right side
    793.40x = 393,158.40
  5. Step 5: Solve for x
    x = 393,158.40/793.40
  6. Step 6: Final answer
    x = 495.54

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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.