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Finding the Fourth Proportional to 791.72, 1,091.57 and 570.29

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Solution

The fourth proportional to 791.72, 1,091.57 and 570.29 is: 786.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.72 : 1,091.57 = 570.29 : x
  2. Step 2: Convert to fraction form
    791.72/1,091.57 = 570.29/x
  3. Step 3: Cross multiply
    791.72x = 1,091.57 × 570.29
  4. Step 4: Simplify right side
    791.72x = 622,507.42
  5. Step 5: Solve for x
    x = 622,507.42/791.72
  6. Step 6: Final answer
    x = 786.28

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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.