Home / 3,859.20-5,325.70-2,090.80

Finding the Fourth Proportional to 3,859.20, 5,325.70 and 2,090.80

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Solution

The fourth proportional to 3,859.20, 5,325.70 and 2,090.80 is: 2,885.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,859.20 : 5,325.70 = 2,090.80 : x
  2. Step 2: Convert to fraction form
    3,859.20/5,325.70 = 2,090.80/x
  3. Step 3: Cross multiply
    3,859.20x = 5,325.70 × 2,090.80
  4. Step 4: Simplify right side
    3,859.20x = 11,134,973.56
  5. Step 5: Solve for x
    x = 11,134,973.56/3,859.20
  6. Step 6: Final answer
    x = 2,885.31

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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.