Home / 1,380.20-2,080.62-1,288.54

Finding the Fourth Proportional to 1,380.20, 2,080.62 and 1,288.54

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Solution

The fourth proportional to 1,380.20, 2,080.62 and 1,288.54 is: 1,942.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.20 : 2,080.62 = 1,288.54 : x
  2. Step 2: Convert to fraction form
    1,380.20/2,080.62 = 1,288.54/x
  3. Step 3: Cross multiply
    1,380.20x = 2,080.62 × 1,288.54
  4. Step 4: Simplify right side
    1,380.20x = 2,680,962.09
  5. Step 5: Solve for x
    x = 2,680,962.09/1,380.20
  6. Step 6: Final answer
    x = 1,942.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.