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Finding the Fourth Proportional to 1,279.62, 1,919.55 and 791.65

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Solution

The fourth proportional to 1,279.62, 1,919.55 and 791.65 is: 1,187.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.62 : 1,919.55 = 791.65 : x
  2. Step 2: Convert to fraction form
    1,279.62/1,919.55 = 791.65/x
  3. Step 3: Cross multiply
    1,279.62x = 1,919.55 × 791.65
  4. Step 4: Simplify right side
    1,279.62x = 1,519,607.27
  5. Step 5: Solve for x
    x = 1,519,607.27/1,279.62
  6. Step 6: Final answer
    x = 1,187.54

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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.