Home / 3,869.78-5,340.20-2,191.28

Finding the Fourth Proportional to 3,869.78, 5,340.20 and 2,191.28

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Solution

The fourth proportional to 3,869.78, 5,340.20 and 2,191.28 is: 3,023.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,869.78 : 5,340.20 = 2,191.28 : x
  2. Step 2: Convert to fraction form
    3,869.78/5,340.20 = 2,191.28/x
  3. Step 3: Cross multiply
    3,869.78x = 5,340.20 × 2,191.28
  4. Step 4: Simplify right side
    3,869.78x = 11,701,835.80
  5. Step 5: Solve for x
    x = 11,701,835.80/3,869.78
  6. Step 6: Final answer
    x = 3,023.91

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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.