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Finding the Fourth Proportional to 3,920.84, 5,879.13 and 1,287.73

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Solution

The fourth proportional to 3,920.84, 5,879.13 and 1,287.73 is: 1,930.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.84 : 5,879.13 = 1,287.73 : x
  2. Step 2: Convert to fraction form
    3,920.84/5,879.13 = 1,287.73/x
  3. Step 3: Cross multiply
    3,920.84x = 5,879.13 × 1,287.73
  4. Step 4: Simplify right side
    3,920.84x = 7,570,732.07
  5. Step 5: Solve for x
    x = 7,570,732.07/3,920.84
  6. Step 6: Final answer
    x = 1,930.90

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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.