Home / 2,620.14-3,929.40-1,387.32

Finding the Fourth Proportional to 2,620.14, 3,929.40 and 1,387.32

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Solution

The fourth proportional to 2,620.14, 3,929.40 and 1,387.32 is: 2,080.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,620.14 : 3,929.40 = 1,387.32 : x
  2. Step 2: Convert to fraction form
    2,620.14/3,929.40 = 1,387.32/x
  3. Step 3: Cross multiply
    2,620.14x = 3,929.40 × 1,387.32
  4. Step 4: Simplify right side
    2,620.14x = 5,451,335.21
  5. Step 5: Solve for x
    x = 5,451,335.21/2,620.14
  6. Step 6: Final answer
    x = 2,080.55

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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.