Home / 3,869.78-5,340.25-2,101.38

Finding the Fourth Proportional to 3,869.78, 5,340.25 and 2,101.38

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Solution

The fourth proportional to 3,869.78, 5,340.25 and 2,101.38 is: 2,899.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,869.78 : 5,340.25 = 2,101.38 : x
  2. Step 2: Convert to fraction form
    3,869.78/5,340.25 = 2,101.38/x
  3. Step 3: Cross multiply
    3,869.78x = 5,340.25 × 2,101.38
  4. Step 4: Simplify right side
    3,869.78x = 11,221,894.55
  5. Step 5: Solve for x
    x = 11,221,894.55/3,869.78
  6. Step 6: Final answer
    x = 2,899.88

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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.