Home / 3,878.93-5,809.12-2,121.30

Finding the Fourth Proportional to 3,878.93, 5,809.12 and 2,121.30

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Solution

The fourth proportional to 3,878.93, 5,809.12 and 2,121.30 is: 3,176.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,878.93 : 5,809.12 = 2,121.30 : x
  2. Step 2: Convert to fraction form
    3,878.93/5,809.12 = 2,121.30/x
  3. Step 3: Cross multiply
    3,878.93x = 5,809.12 × 2,121.30
  4. Step 4: Simplify right side
    3,878.93x = 12,322,886.26
  5. Step 5: Solve for x
    x = 12,322,886.26/3,878.93
  6. Step 6: Final answer
    x = 3,176.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.