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Finding the Fourth Proportional to 2,686.87, 4,031.25 and 838.45

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Solution

The fourth proportional to 2,686.87, 4,031.25 and 838.45 is: 1,257.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,686.87 : 4,031.25 = 838.45 : x
  2. Step 2: Convert to fraction form
    2,686.87/4,031.25 = 838.45/x
  3. Step 3: Cross multiply
    2,686.87x = 4,031.25 × 838.45
  4. Step 4: Simplify right side
    2,686.87x = 3,379,977.21
  5. Step 5: Solve for x
    x = 3,379,977.21/2,686.87
  6. Step 6: Final answer
    x = 1,257.96

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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.