Home / 2,078.78-3,118.35-691.70

Finding the Fourth Proportional to 2,078.78, 3,118.35 and 691.70

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Solution

The fourth proportional to 2,078.78, 3,118.35 and 691.70 is: 1,037.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,078.78 : 3,118.35 = 691.70 : x
  2. Step 2: Convert to fraction form
    2,078.78/3,118.35 = 691.70/x
  3. Step 3: Cross multiply
    2,078.78x = 3,118.35 × 691.70
  4. Step 4: Simplify right side
    2,078.78x = 2,156,962.70
  5. Step 5: Solve for x
    x = 2,156,962.70/2,078.78
  6. Step 6: Final answer
    x = 1,037.61

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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.