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Finding the Fourth Proportional to 2,540.63, 3,811.14 and 691.89

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Solution

The fourth proportional to 2,540.63, 3,811.14 and 691.89 is: 1,037.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,540.63 : 3,811.14 = 691.89 : x
  2. Step 2: Convert to fraction form
    2,540.63/3,811.14 = 691.89/x
  3. Step 3: Cross multiply
    2,540.63x = 3,811.14 × 691.89
  4. Step 4: Simplify right side
    2,540.63x = 2,636,889.65
  5. Step 5: Solve for x
    x = 2,636,889.65/2,540.63
  6. Step 6: Final answer
    x = 1,037.89

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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.