Home / 3,128.68-4,307.94-2,778.76

Finding the Fourth Proportional to 3,128.68, 4,307.94 and 2,778.76

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Solution

The fourth proportional to 3,128.68, 4,307.94 and 2,778.76 is: 3,826.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.68 : 4,307.94 = 2,778.76 : x
  2. Step 2: Convert to fraction form
    3,128.68/4,307.94 = 2,778.76/x
  3. Step 3: Cross multiply
    3,128.68x = 4,307.94 × 2,778.76
  4. Step 4: Simplify right side
    3,128.68x = 11,970,731.35
  5. Step 5: Solve for x
    x = 11,970,731.35/3,128.68
  6. Step 6: Final answer
    x = 3,826.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.