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Finding the Fourth Proportional to 2,419.14, 3,629.31 and 687.75

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Solution

The fourth proportional to 2,419.14, 3,629.31 and 687.75 is: 1,031.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,419.14 : 3,629.31 = 687.75 : x
  2. Step 2: Convert to fraction form
    2,419.14/3,629.31 = 687.75/x
  3. Step 3: Cross multiply
    2,419.14x = 3,629.31 × 687.75
  4. Step 4: Simplify right side
    2,419.14x = 2,496,057.95
  5. Step 5: Solve for x
    x = 2,496,057.95/2,419.14
  6. Step 6: Final answer
    x = 1,031.80

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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.