Home / 2,758.40-4,138.62-1,278.34

Finding the Fourth Proportional to 2,758.40, 4,138.62 and 1,278.34

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Solution

The fourth proportional to 2,758.40, 4,138.62 and 1,278.34 is: 1,917.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,758.40 : 4,138.62 = 1,278.34 : x
  2. Step 2: Convert to fraction form
    2,758.40/4,138.62 = 1,278.34/x
  3. Step 3: Cross multiply
    2,758.40x = 4,138.62 × 1,278.34
  4. Step 4: Simplify right side
    2,758.40x = 5,290,563.49
  5. Step 5: Solve for x
    x = 5,290,563.49/2,758.40
  6. Step 6: Final answer
    x = 1,917.98

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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.