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Finding the Fourth Proportional to 791.75, 1,090.80 and 570.33

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Solution

The fourth proportional to 791.75, 1,090.80 and 570.33 is: 785.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.75 : 1,090.80 = 570.33 : x
  2. Step 2: Convert to fraction form
    791.75/1,090.80 = 570.33/x
  3. Step 3: Cross multiply
    791.75x = 1,090.80 × 570.33
  4. Step 4: Simplify right side
    791.75x = 622,115.96
  5. Step 5: Solve for x
    x = 622,115.96/791.75
  6. Step 6: Final answer
    x = 785.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.