Home / 3,876.20-5,814.30-1,279.40

Finding the Fourth Proportional to 3,876.20, 5,814.30 and 1,279.40

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Solution

The fourth proportional to 3,876.20, 5,814.30 and 1,279.40 is: 1,919.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,876.20 : 5,814.30 = 1,279.40 : x
  2. Step 2: Convert to fraction form
    3,876.20/5,814.30 = 1,279.40/x
  3. Step 3: Cross multiply
    3,876.20x = 5,814.30 × 1,279.40
  4. Step 4: Simplify right side
    3,876.20x = 7,438,815.42
  5. Step 5: Solve for x
    x = 7,438,815.42/3,876.20
  6. Step 6: Final answer
    x = 1,919.10

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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.