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Finding the Fourth Proportional to 2,619.80, 3,929.69 and 671.95

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Solution

The fourth proportional to 2,619.80, 3,929.69 and 671.95 is: 1,007.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.80 : 3,929.69 = 671.95 : x
  2. Step 2: Convert to fraction form
    2,619.80/3,929.69 = 671.95/x
  3. Step 3: Cross multiply
    2,619.80x = 3,929.69 × 671.95
  4. Step 4: Simplify right side
    2,619.80x = 2,640,555.20
  5. Step 5: Solve for x
    x = 2,640,555.20/2,619.80
  6. Step 6: Final answer
    x = 1,007.92

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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.