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Finding the Fourth Proportional to 7,141.75, 9,855.75 and 3,997.87

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Solution

The fourth proportional to 7,141.75, 9,855.75 and 3,997.87 is: 5,517.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,141.75 : 9,855.75 = 3,997.87 : x
  2. Step 2: Convert to fraction form
    7,141.75/9,855.75 = 3,997.87/x
  3. Step 3: Cross multiply
    7,141.75x = 9,855.75 × 3,997.87
  4. Step 4: Simplify right side
    7,141.75x = 39,402,007.25
  5. Step 5: Solve for x
    x = 39,402,007.25/7,141.75
  6. Step 6: Final answer
    x = 5,517.14

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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.