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Finding the Fourth Proportional to 791.83, 1,187.75 and 505.09

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Solution

The fourth proportional to 791.83, 1,187.75 and 505.09 is: 757.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.83 : 1,187.75 = 505.09 : x
  2. Step 2: Convert to fraction form
    791.83/1,187.75 = 505.09/x
  3. Step 3: Cross multiply
    791.83x = 1,187.75 × 505.09
  4. Step 4: Simplify right side
    791.83x = 599,920.65
  5. Step 5: Solve for x
    x = 599,920.65/791.83
  6. Step 6: Final answer
    x = 757.64

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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.