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Finding the Fourth Proportional to 2,619.74, 3,929.52 and 671.87

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Solution

The fourth proportional to 2,619.74, 3,929.52 and 671.87 is: 1,007.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.74 : 3,929.52 = 671.87 : x
  2. Step 2: Convert to fraction form
    2,619.74/3,929.52 = 671.87/x
  3. Step 3: Cross multiply
    2,619.74x = 3,929.52 × 671.87
  4. Step 4: Simplify right side
    2,619.74x = 2,640,126.60
  5. Step 5: Solve for x
    x = 2,640,126.60/2,619.74
  6. Step 6: Final answer
    x = 1,007.78

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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.