Home / 5,138.58-7,091.25-2,780.72

Finding the Fourth Proportional to 5,138.58, 7,091.25 and 2,780.72

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Solution

The fourth proportional to 5,138.58, 7,091.25 and 2,780.72 is: 3,837.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,138.58 : 7,091.25 = 2,780.72 : x
  2. Step 2: Convert to fraction form
    5,138.58/7,091.25 = 2,780.72/x
  3. Step 3: Cross multiply
    5,138.58x = 7,091.25 × 2,780.72
  4. Step 4: Simplify right side
    5,138.58x = 19,718,761.41
  5. Step 5: Solve for x
    x = 19,718,761.41/5,138.58
  6. Step 6: Final answer
    x = 3,837.39

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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.