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Finding the Fourth Proportional to 2,619.52, 3,929.28 and 671.74

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Solution

The fourth proportional to 2,619.52, 3,929.28 and 671.74 is: 1,007.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,619.52 : 3,929.28 = 671.74 : x
  2. Step 2: Convert to fraction form
    2,619.52/3,929.28 = 671.74/x
  3. Step 3: Cross multiply
    2,619.52x = 3,929.28 × 671.74
  4. Step 4: Simplify right side
    2,619.52x = 2,639,454.55
  5. Step 5: Solve for x
    x = 2,639,454.55/2,619.52
  6. Step 6: Final answer
    x = 1,007.61

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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.