Home / 5,138.07-7,090.55-2,780.21

Finding the Fourth Proportional to 5,138.07, 7,090.55 and 2,780.21

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Solution

The fourth proportional to 5,138.07, 7,090.55 and 2,780.21 is: 3,836.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,138.07 : 7,090.55 = 2,780.21 : x
  2. Step 2: Convert to fraction form
    5,138.07/7,090.55 = 2,780.21/x
  3. Step 3: Cross multiply
    5,138.07x = 7,090.55 × 2,780.21
  4. Step 4: Simplify right side
    5,138.07x = 19,713,168.66
  5. Step 5: Solve for x
    x = 19,713,168.66/5,138.07
  6. Step 6: Final answer
    x = 3,836.69

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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.