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Finding the Fourth Proportional to 2,635.62, 3,953.41 and 687.82

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Solution

The fourth proportional to 2,635.62, 3,953.41 and 687.82 is: 1,031.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,635.62 : 3,953.41 = 687.82 : x
  2. Step 2: Convert to fraction form
    2,635.62/3,953.41 = 687.82/x
  3. Step 3: Cross multiply
    2,635.62x = 3,953.41 × 687.82
  4. Step 4: Simplify right side
    2,635.62x = 2,719,214.70
  5. Step 5: Solve for x
    x = 2,719,214.70/2,635.62
  6. Step 6: Final answer
    x = 1,031.72

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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.