Home / 2,119.40-3,178.14-1,378.28

Finding the Fourth Proportional to 2,119.40, 3,178.14 and 1,378.28

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Solution

The fourth proportional to 2,119.40, 3,178.14 and 1,378.28 is: 2,066.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,119.40 : 3,178.14 = 1,378.28 : x
  2. Step 2: Convert to fraction form
    2,119.40/3,178.14 = 1,378.28/x
  3. Step 3: Cross multiply
    2,119.40x = 3,178.14 × 1,378.28
  4. Step 4: Simplify right side
    2,119.40x = 4,380,366.80
  5. Step 5: Solve for x
    x = 4,380,366.80/2,119.40
  6. Step 6: Final answer
    x = 2,066.80

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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.