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Finding the Fourth Proportional to 3,589.80, 5,385 and 992.73

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Solution

The fourth proportional to 3,589.80, 5,385 and 992.73 is: 1,489.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,589.80 : 5,385 = 992.73 : x
  2. Step 2: Convert to fraction form
    3,589.80/5,385 = 992.73/x
  3. Step 3: Cross multiply
    3,589.80x = 5,385 × 992.73
  4. Step 4: Simplify right side
    3,589.80x = 5,345,851.05
  5. Step 5: Solve for x
    x = 5,345,851.05/3,589.80
  6. Step 6: Final answer
    x = 1,489.18

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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.