Home / 3,936.18-5,431.80-2,143.65

Finding the Fourth Proportional to 3,936.18, 5,431.80 and 2,143.65

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Solution

The fourth proportional to 3,936.18, 5,431.80 and 2,143.65 is: 2,958.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,936.18 : 5,431.80 = 2,143.65 : x
  2. Step 2: Convert to fraction form
    3,936.18/5,431.80 = 2,143.65/x
  3. Step 3: Cross multiply
    3,936.18x = 5,431.80 × 2,143.65
  4. Step 4: Simplify right side
    3,936.18x = 11,643,878.07
  5. Step 5: Solve for x
    x = 11,643,878.07/3,936.18
  6. Step 6: Final answer
    x = 2,958.17

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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.