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Finding the Fourth Proportional to 7,131.80, 9,843.60 and 4,149.80

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Solution

The fourth proportional to 7,131.80, 9,843.60 and 4,149.80 is: 5,727.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,131.80 : 9,843.60 = 4,149.80 : x
  2. Step 2: Convert to fraction form
    7,131.80/9,843.60 = 4,149.80/x
  3. Step 3: Cross multiply
    7,131.80x = 9,843.60 × 4,149.80
  4. Step 4: Simplify right side
    7,131.80x = 40,848,971.28
  5. Step 5: Solve for x
    x = 40,848,971.28/7,131.80
  6. Step 6: Final answer
    x = 5,727.72

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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.