Home / 1,380.21-2,074.41-1,278.36

Finding the Fourth Proportional to 1,380.21, 2,074.41 and 1,278.36

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Solution

The fourth proportional to 1,380.21, 2,074.41 and 1,278.36 is: 1,921.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.21 : 2,074.41 = 1,278.36 : x
  2. Step 2: Convert to fraction form
    1,380.21/2,074.41 = 1,278.36/x
  3. Step 3: Cross multiply
    1,380.21x = 2,074.41 × 1,278.36
  4. Step 4: Simplify right side
    1,380.21x = 2,651,842.77
  5. Step 5: Solve for x
    x = 2,651,842.77/1,380.21
  6. Step 6: Final answer
    x = 1,921.33

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1.5x scale

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.