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Finding the Fourth Proportional to 2,857.50, 4,286.25 and 909.86

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Solution

The fourth proportional to 2,857.50, 4,286.25 and 909.86 is: 1,364.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,857.50 : 4,286.25 = 909.86 : x
  2. Step 2: Convert to fraction form
    2,857.50/4,286.25 = 909.86/x
  3. Step 3: Cross multiply
    2,857.50x = 4,286.25 × 909.86
  4. Step 4: Simplify right side
    2,857.50x = 3,899,865.99
  5. Step 5: Solve for x
    x = 3,899,865.99/2,857.50
  6. Step 6: Final answer
    x = 1,364.78

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Double scale
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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.