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Finding the Fourth Proportional to 2,635.61, 3,953.41 and 687.56

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Solution

The fourth proportional to 2,635.61, 3,953.41 and 687.56 is: 1,031.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,635.61 : 3,953.41 = 687.56 : x
  2. Step 2: Convert to fraction form
    2,635.61/3,953.41 = 687.56/x
  3. Step 3: Cross multiply
    2,635.61x = 3,953.41 × 687.56
  4. Step 4: Simplify right side
    2,635.61x = 2,718,185.09
  5. Step 5: Solve for x
    x = 2,718,185.09/2,635.61
  6. Step 6: Final answer
    x = 1,031.33

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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.