Home / 5,138.78-7,091.56-2,780.92

Finding the Fourth Proportional to 5,138.78, 7,091.56 and 2,780.92

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Solution

The fourth proportional to 5,138.78, 7,091.56 and 2,780.92 is: 3,837.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,138.78 : 7,091.56 = 2,780.92 : x
  2. Step 2: Convert to fraction form
    5,138.78/7,091.56 = 2,780.92/x
  3. Step 3: Cross multiply
    5,138.78x = 7,091.56 × 2,780.92
  4. Step 4: Simplify right side
    5,138.78x = 19,721,061.04
  5. Step 5: Solve for x
    x = 19,721,061.04/5,138.78
  6. Step 6: Final answer
    x = 3,837.69

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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.