Home / 3,979.20-5,476.80-2,858.40

Finding the Fourth Proportional to 3,979.20, 5,476.80 and 2,858.40

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Solution

The fourth proportional to 3,979.20, 5,476.80 and 2,858.40 is: 3,934.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.20 : 5,476.80 = 2,858.40 : x
  2. Step 2: Convert to fraction form
    3,979.20/5,476.80 = 2,858.40/x
  3. Step 3: Cross multiply
    3,979.20x = 5,476.80 × 2,858.40
  4. Step 4: Simplify right side
    3,979.20x = 15,654,885.12
  5. Step 5: Solve for x
    x = 15,654,885.12/3,979.20
  6. Step 6: Final answer
    x = 3,934.18

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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.