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Finding the Fourth Proportional to 2,619.75, 3,929.87 and 671.97

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Solution

The fourth proportional to 2,619.75, 3,929.87 and 671.97 is: 1,008.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.75 : 3,929.87 = 671.97 : x
  2. Step 2: Convert to fraction form
    2,619.75/3,929.87 = 671.97/x
  3. Step 3: Cross multiply
    2,619.75x = 3,929.87 × 671.97
  4. Step 4: Simplify right side
    2,619.75x = 2,640,751.38
  5. Step 5: Solve for x
    x = 2,640,751.38/2,619.75
  6. Step 6: Final answer
    x = 1,008.02

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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.