Home / 7,141.28-9,855.12-3,997.40

Finding the Fourth Proportional to 7,141.28, 9,855.12 and 3,997.40

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Solution

The fourth proportional to 7,141.28, 9,855.12 and 3,997.40 is: 5,516.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,141.28 : 9,855.12 = 3,997.40 : x
  2. Step 2: Convert to fraction form
    7,141.28/9,855.12 = 3,997.40/x
  3. Step 3: Cross multiply
    7,141.28x = 9,855.12 × 3,997.40
  4. Step 4: Simplify right side
    7,141.28x = 39,394,856.69
  5. Step 5: Solve for x
    x = 39,394,856.69/7,141.28
  6. Step 6: Final answer
    x = 5,516.50

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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.