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Finding the Fourth Proportional to 7,991.79, 11,990.57 and 2,798.43

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Solution

The fourth proportional to 7,991.79, 11,990.57 and 2,798.43 is: 4,198.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,991.79 : 11,990.57 = 2,798.43 : x
  2. Step 2: Convert to fraction form
    7,991.79/11,990.57 = 2,798.43/x
  3. Step 3: Cross multiply
    7,991.79x = 11,990.57 × 2,798.43
  4. Step 4: Simplify right side
    7,991.79x = 33,554,756.81
  5. Step 5: Solve for x
    x = 33,554,756.81/7,991.79
  6. Step 6: Final answer
    x = 4,198.65

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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.