Home / 3,899.40-5,381.17-2,106.88

Finding the Fourth Proportional to 3,899.40, 5,381.17 and 2,106.88

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Solution

The fourth proportional to 3,899.40, 5,381.17 and 2,106.88 is: 2,907.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.40 : 5,381.17 = 2,106.88 : x
  2. Step 2: Convert to fraction form
    3,899.40/5,381.17 = 2,106.88/x
  3. Step 3: Cross multiply
    3,899.40x = 5,381.17 × 2,106.88
  4. Step 4: Simplify right side
    3,899.40x = 11,337,460.73
  5. Step 5: Solve for x
    x = 11,337,460.73/3,899.40
  6. Step 6: Final answer
    x = 2,907.49

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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.