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Finding the Fourth Proportional to 7,857.82, 10,843.78 and 4,321.20

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Solution

The fourth proportional to 7,857.82, 10,843.78 and 4,321.20 is: 5,963.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,857.82 : 10,843.78 = 4,321.20 : x
  2. Step 2: Convert to fraction form
    7,857.82/10,843.78 = 4,321.20/x
  3. Step 3: Cross multiply
    7,857.82x = 10,843.78 × 4,321.20
  4. Step 4: Simplify right side
    7,857.82x = 46,858,142.14
  5. Step 5: Solve for x
    x = 46,858,142.14/7,857.82
  6. Step 6: Final answer
    x = 5,963.25

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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.