Home / 2,108.35-3,162.90-721.36

Finding the Fourth Proportional to 2,108.35, 3,162.90 and 721.36

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Solution

The fourth proportional to 2,108.35, 3,162.90 and 721.36 is: 1,082.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,108.35 : 3,162.90 = 721.36 : x
  2. Step 2: Convert to fraction form
    2,108.35/3,162.90 = 721.36/x
  3. Step 3: Cross multiply
    2,108.35x = 3,162.90 × 721.36
  4. Step 4: Simplify right side
    2,108.35x = 2,281,589.54
  5. Step 5: Solve for x
    x = 2,281,589.54/2,108.35
  6. Step 6: Final answer
    x = 1,082.17

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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.