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Finding the Fourth Proportional to 7,322.80, 10,991.40 and 3,629.20

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Solution

The fourth proportional to 7,322.80, 10,991.40 and 3,629.20 is: 5,447.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,322.80 : 10,991.40 = 3,629.20 : x
  2. Step 2: Convert to fraction form
    7,322.80/10,991.40 = 3,629.20/x
  3. Step 3: Cross multiply
    7,322.80x = 10,991.40 × 3,629.20
  4. Step 4: Simplify right side
    7,322.80x = 39,889,988.88
  5. Step 5: Solve for x
    x = 39,889,988.88/7,322.80
  6. Step 6: Final answer
    x = 5,447.37

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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.