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Finding the Fourth Proportional to 3,857.85, 5,786.13 and 1,393.83

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Solution

The fourth proportional to 3,857.85, 5,786.13 and 1,393.83 is: 2,090.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,857.85 : 5,786.13 = 1,393.83 : x
  2. Step 2: Convert to fraction form
    3,857.85/5,786.13 = 1,393.83/x
  3. Step 3: Cross multiply
    3,857.85x = 5,786.13 × 1,393.83
  4. Step 4: Simplify right side
    3,857.85x = 8,064,881.58
  5. Step 5: Solve for x
    x = 8,064,881.58/3,857.85
  6. Step 6: Final answer
    x = 2,090.51

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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.