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Finding the Fourth Proportional to 2,639.44, 3,959.00 and 691.64

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Solution

The fourth proportional to 2,639.44, 3,959.00 and 691.64 is: 1,037.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.44 : 3,959.00 = 691.64 : x
  2. Step 2: Convert to fraction form
    2,639.44/3,959.00 = 691.64/x
  3. Step 3: Cross multiply
    2,639.44x = 3,959.00 × 691.64
  4. Step 4: Simplify right side
    2,639.44x = 2,738,198.89
  5. Step 5: Solve for x
    x = 2,738,198.89/2,639.44
  6. Step 6: Final answer
    x = 1,037.42

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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.