Home / 3,918.21-5,406.87-2,239.59

Finding the Fourth Proportional to 3,918.21, 5,406.87 and 2,239.59

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Solution

The fourth proportional to 3,918.21, 5,406.87 and 2,239.59 is: 3,090.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,918.21 : 5,406.87 = 2,239.59 : x
  2. Step 2: Convert to fraction form
    3,918.21/5,406.87 = 2,239.59/x
  3. Step 3: Cross multiply
    3,918.21x = 5,406.87 × 2,239.59
  4. Step 4: Simplify right side
    3,918.21x = 12,109,171.98
  5. Step 5: Solve for x
    x = 12,109,171.98/3,918.21
  6. Step 6: Final answer
    x = 3,090.49

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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.