Home / 3,857.20-5,781.30-2,215.30

Finding the Fourth Proportional to 3,857.20, 5,781.30 and 2,215.30

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Solution

The fourth proportional to 3,857.20, 5,781.30 and 2,215.30 is: 3,320.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,857.20 : 5,781.30 = 2,215.30 : x
  2. Step 2: Convert to fraction form
    3,857.20/5,781.30 = 2,215.30/x
  3. Step 3: Cross multiply
    3,857.20x = 5,781.30 × 2,215.30
  4. Step 4: Simplify right side
    3,857.20x = 12,807,313.89
  5. Step 5: Solve for x
    x = 12,807,313.89/3,857.20
  6. Step 6: Final answer
    x = 3,320.37

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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.