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Finding the Fourth Proportional to 2,251.79, 3,377.91 and 691.77

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Solution

The fourth proportional to 2,251.79, 3,377.91 and 691.77 is: 1,037.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,251.79 : 3,377.91 = 691.77 : x
  2. Step 2: Convert to fraction form
    2,251.79/3,377.91 = 691.77/x
  3. Step 3: Cross multiply
    2,251.79x = 3,377.91 × 691.77
  4. Step 4: Simplify right side
    2,251.79x = 2,336,736.80
  5. Step 5: Solve for x
    x = 2,336,736.80/2,251.79
  6. Step 6: Final answer
    x = 1,037.73

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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.