Home / 3,979.20-5,488.56-2,405.28

Finding the Fourth Proportional to 3,979.20, 5,488.56 and 2,405.28

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Solution

The fourth proportional to 3,979.20, 5,488.56 and 2,405.28 is: 3,317.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.20 : 5,488.56 = 2,405.28 : x
  2. Step 2: Convert to fraction form
    3,979.20/5,488.56 = 2,405.28/x
  3. Step 3: Cross multiply
    3,979.20x = 5,488.56 × 2,405.28
  4. Step 4: Simplify right side
    3,979.20x = 13,201,523.60
  5. Step 5: Solve for x
    x = 13,201,523.60/3,979.20
  6. Step 6: Final answer
    x = 3,317.63

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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.