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Finding the Fourth Proportional to 2,687.99, 4,031.44 and 838.65

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Solution

The fourth proportional to 2,687.99, 4,031.44 and 838.65 is: 1,257.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,687.99 : 4,031.44 = 838.65 : x
  2. Step 2: Convert to fraction form
    2,687.99/4,031.44 = 838.65/x
  3. Step 3: Cross multiply
    2,687.99x = 4,031.44 × 838.65
  4. Step 4: Simplify right side
    2,687.99x = 3,380,980.18
  5. Step 5: Solve for x
    x = 3,380,980.18/2,687.99
  6. Step 6: Final answer
    x = 1,257.81

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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.