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Finding the Fourth Proportional to 3,908.40, 5,855.40 and 3,289.20

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Solution

The fourth proportional to 3,908.40, 5,855.40 and 3,289.20 is: 4,927.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,908.40 : 5,855.40 = 3,289.20 : x
  2. Step 2: Convert to fraction form
    3,908.40/5,855.40 = 3,289.20/x
  3. Step 3: Cross multiply
    3,908.40x = 5,855.40 × 3,289.20
  4. Step 4: Simplify right side
    3,908.40x = 19,259,581.68
  5. Step 5: Solve for x
    x = 19,259,581.68/3,908.40
  6. Step 6: Final answer
    x = 4,927.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.