Home / 7,121.56-9,814.44-5,128.60

Finding the Fourth Proportional to 7,121.56, 9,814.44 and 5,128.60

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Solution

The fourth proportional to 7,121.56, 9,814.44 and 5,128.60 is: 7,067.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.56 : 9,814.44 = 5,128.60 : x
  2. Step 2: Convert to fraction form
    7,121.56/9,814.44 = 5,128.60/x
  3. Step 3: Cross multiply
    7,121.56x = 9,814.44 × 5,128.60
  4. Step 4: Simplify right side
    7,121.56x = 50,334,336.98
  5. Step 5: Solve for x
    x = 50,334,336.98/7,121.56
  6. Step 6: Final answer
    x = 7,067.88

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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.