Home / 5,138.52-7,091.15-2,780.70

Finding the Fourth Proportional to 5,138.52, 7,091.15 and 2,780.70

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Solution

The fourth proportional to 5,138.52, 7,091.15 and 2,780.70 is: 3,837.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,138.52 : 7,091.15 = 2,780.70 : x
  2. Step 2: Convert to fraction form
    5,138.52/7,091.15 = 2,780.70/x
  3. Step 3: Cross multiply
    5,138.52x = 7,091.15 × 2,780.70
  4. Step 4: Simplify right side
    5,138.52x = 19,718,346.90
  5. Step 5: Solve for x
    x = 19,718,346.90/5,138.52
  6. Step 6: Final answer
    x = 3,837.36

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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.