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Finding the Fourth Proportional to 2,857.15, 4,286.04 and 908.90

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Solution

The fourth proportional to 2,857.15, 4,286.04 and 908.90 is: 1,363.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,857.15 : 4,286.04 = 908.90 : x
  2. Step 2: Convert to fraction form
    2,857.15/4,286.04 = 908.90/x
  3. Step 3: Cross multiply
    2,857.15x = 4,286.04 × 908.90
  4. Step 4: Simplify right side
    2,857.15x = 3,895,571.04
  5. Step 5: Solve for x
    x = 3,895,571.04/2,857.15
  6. Step 6: Final answer
    x = 1,363.45

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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.