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Finding the Fourth Proportional to 7,996.80, 11,979.90 and 4,297.80

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Solution

The fourth proportional to 7,996.80, 11,979.90 and 4,297.80 is: 6,438.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,996.80 : 11,979.90 = 4,297.80 : x
  2. Step 2: Convert to fraction form
    7,996.80/11,979.90 = 4,297.80/x
  3. Step 3: Cross multiply
    7,996.80x = 11,979.90 × 4,297.80
  4. Step 4: Simplify right side
    7,996.80x = 51,487,214.22
  5. Step 5: Solve for x
    x = 51,487,214.22/7,996.80
  6. Step 6: Final answer
    x = 6,438.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.