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Finding the Fourth Proportional to 2,108.88, 3,163.00 and 721.90

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Solution

The fourth proportional to 2,108.88, 3,163.00 and 721.90 is: 1,082.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,108.88 : 3,163.00 = 721.90 : x
  2. Step 2: Convert to fraction form
    2,108.88/3,163.00 = 721.90/x
  3. Step 3: Cross multiply
    2,108.88x = 3,163.00 × 721.90
  4. Step 4: Simplify right side
    2,108.88x = 2,283,376.36
  5. Step 5: Solve for x
    x = 2,283,376.36/2,108.88
  6. Step 6: Final answer
    x = 1,082.74

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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.