Home / 2,419.21-3,628.82-687.84

Finding the Fourth Proportional to 2,419.21, 3,628.82 and 687.84

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Solution

The fourth proportional to 2,419.21, 3,628.82 and 687.84 is: 1,031.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,419.21 : 3,628.82 = 687.84 : x
  2. Step 2: Convert to fraction form
    2,419.21/3,628.82 = 687.84/x
  3. Step 3: Cross multiply
    2,419.21x = 3,628.82 × 687.84
  4. Step 4: Simplify right side
    2,419.21x = 2,496,047.55
  5. Step 5: Solve for x
    x = 2,496,047.55/2,419.21
  6. Step 6: Final answer
    x = 1,031.76

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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.