Home / 5,138.90-7,091.72-2,781.03

Finding the Fourth Proportional to 5,138.90, 7,091.72 and 2,781.03

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Solution

The fourth proportional to 5,138.90, 7,091.72 and 2,781.03 is: 3,837.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,138.90 : 7,091.72 = 2,781.03 : x
  2. Step 2: Convert to fraction form
    5,138.90/7,091.72 = 2,781.03/x
  3. Step 3: Cross multiply
    5,138.90x = 7,091.72 × 2,781.03
  4. Step 4: Simplify right side
    5,138.90x = 19,722,272.17
  5. Step 5: Solve for x
    x = 19,722,272.17/5,138.90
  6. Step 6: Final answer
    x = 3,837.84

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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.