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Finding the Fourth Proportional to 7,322.85, 10,985.04 and 2,128.73

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Solution

The fourth proportional to 7,322.85, 10,985.04 and 2,128.73 is: 3,193.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,322.85 : 10,985.04 = 2,128.73 : x
  2. Step 2: Convert to fraction form
    7,322.85/10,985.04 = 2,128.73/x
  3. Step 3: Cross multiply
    7,322.85x = 10,985.04 × 2,128.73
  4. Step 4: Simplify right side
    7,322.85x = 23,384,129.27
  5. Step 5: Solve for x
    x = 23,384,129.27/7,322.85
  6. Step 6: Final answer
    x = 3,193.31

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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.