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Finding the Fourth Proportional to 5,791.10, 7,991.72 and 3,138.51

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Solution

The fourth proportional to 5,791.10, 7,991.72 and 3,138.51 is: 4,331.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,791.10 : 7,991.72 = 3,138.51 : x
  2. Step 2: Convert to fraction form
    5,791.10/7,991.72 = 3,138.51/x
  3. Step 3: Cross multiply
    5,791.10x = 7,991.72 × 3,138.51
  4. Step 4: Simplify right side
    5,791.10x = 25,082,077.44
  5. Step 5: Solve for x
    x = 25,082,077.44/5,791.10
  6. Step 6: Final answer
    x = 4,331.15

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1.5x scale

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.