Home / 5,129.50-7,078.26-2,891.56

Finding the Fourth Proportional to 5,129.50, 7,078.26 and 2,891.56

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Solution

The fourth proportional to 5,129.50, 7,078.26 and 2,891.56 is: 3,990.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,129.50 : 7,078.26 = 2,891.56 : x
  2. Step 2: Convert to fraction form
    5,129.50/7,078.26 = 2,891.56/x
  3. Step 3: Cross multiply
    5,129.50x = 7,078.26 × 2,891.56
  4. Step 4: Simplify right side
    5,129.50x = 20,467,213.49
  5. Step 5: Solve for x
    x = 20,467,213.49/5,129.50
  6. Step 6: Final answer
    x = 3,990.10

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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.