Home / 5,138.60-7,091.26-2,780.74

Finding the Fourth Proportional to 5,138.60, 7,091.26 and 2,780.74

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Solution

The fourth proportional to 5,138.60, 7,091.26 and 2,780.74 is: 3,837.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,138.60 : 7,091.26 = 2,780.74 : x
  2. Step 2: Convert to fraction form
    5,138.60/7,091.26 = 2,780.74/x
  3. Step 3: Cross multiply
    5,138.60x = 7,091.26 × 2,780.74
  4. Step 4: Simplify right side
    5,138.60x = 19,718,930.05
  5. Step 5: Solve for x
    x = 19,718,930.05/5,138.60
  6. Step 6: Final answer
    x = 3,837.42

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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.