Home / 2,187.78-3,278.79-1,262.85

Finding the Fourth Proportional to 2,187.78, 3,278.79 and 1,262.85

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Solution

The fourth proportional to 2,187.78, 3,278.79 and 1,262.85 is: 1,892.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.78 : 3,278.79 = 1,262.85 : x
  2. Step 2: Convert to fraction form
    2,187.78/3,278.79 = 1,262.85/x
  3. Step 3: Cross multiply
    2,187.78x = 3,278.79 × 1,262.85
  4. Step 4: Simplify right side
    2,187.78x = 4,140,619.95
  5. Step 5: Solve for x
    x = 4,140,619.95/2,187.78
  6. Step 6: Final answer
    x = 1,892.61

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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.