Home / 2,081.78-3,120.30-694.79

Finding the Fourth Proportional to 2,081.78, 3,120.30 and 694.79

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Solution

The fourth proportional to 2,081.78, 3,120.30 and 694.79 is: 1,041.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,081.78 : 3,120.30 = 694.79 : x
  2. Step 2: Convert to fraction form
    2,081.78/3,120.30 = 694.79/x
  3. Step 3: Cross multiply
    2,081.78x = 3,120.30 × 694.79
  4. Step 4: Simplify right side
    2,081.78x = 2,167,953.24
  5. Step 5: Solve for x
    x = 2,167,953.24/2,081.78
  6. Step 6: Final answer
    x = 1,041.39

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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.