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Finding the Fourth Proportional to 2,857.92, 3,943.20 and 1,811.20

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Solution

The fourth proportional to 2,857.92, 3,943.20 and 1,811.20 is: 2,498.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,857.92 : 3,943.20 = 1,811.20 : x
  2. Step 2: Convert to fraction form
    2,857.92/3,943.20 = 1,811.20/x
  3. Step 3: Cross multiply
    2,857.92x = 3,943.20 × 1,811.20
  4. Step 4: Simplify right side
    2,857.92x = 7,141,923.84
  5. Step 5: Solve for x
    x = 7,141,923.84/2,857.92
  6. Step 6: Final answer
    x = 2,498.99

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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.