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Finding the Fourth Proportional to 2,189.45, 3,284.11 and 728.61

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Solution

The fourth proportional to 2,189.45, 3,284.11 and 728.61 is: 1,092.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,189.45 : 3,284.11 = 728.61 : x
  2. Step 2: Convert to fraction form
    2,189.45/3,284.11 = 728.61/x
  3. Step 3: Cross multiply
    2,189.45x = 3,284.11 × 728.61
  4. Step 4: Simplify right side
    2,189.45x = 2,392,833.57
  5. Step 5: Solve for x
    x = 2,392,833.57/2,189.45
  6. Step 6: Final answer
    x = 1,092.90

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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.