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Finding the Fourth Proportional to 2,639.68, 3,959.64 and 691.88

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Solution

The fourth proportional to 2,639.68, 3,959.64 and 691.88 is: 1,037.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.68 : 3,959.64 = 691.88 : x
  2. Step 2: Convert to fraction form
    2,639.68/3,959.64 = 691.88/x
  3. Step 3: Cross multiply
    2,639.68x = 3,959.64 × 691.88
  4. Step 4: Simplify right side
    2,639.68x = 2,739,595.72
  5. Step 5: Solve for x
    x = 2,739,595.72/2,639.68
  6. Step 6: Final answer
    x = 1,037.85

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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.