Home / 1,668.20-2,498.70-1,380.20

Finding the Fourth Proportional to 1,668.20, 2,498.70 and 1,380.20

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Solution

The fourth proportional to 1,668.20, 2,498.70 and 1,380.20 is: 2,067.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,668.20 : 2,498.70 = 1,380.20 : x
  2. Step 2: Convert to fraction form
    1,668.20/2,498.70 = 1,380.20/x
  3. Step 3: Cross multiply
    1,668.20x = 2,498.70 × 1,380.20
  4. Step 4: Simplify right side
    1,668.20x = 3,448,705.74
  5. Step 5: Solve for x
    x = 3,448,705.74/1,668.20
  6. Step 6: Final answer
    x = 2,067.32

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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.