Home / 2,108.75-3,162.80-721.77

Finding the Fourth Proportional to 2,108.75, 3,162.80 and 721.77

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Solution

The fourth proportional to 2,108.75, 3,162.80 and 721.77 is: 1,082.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,108.75 : 3,162.80 = 721.77 : x
  2. Step 2: Convert to fraction form
    2,108.75/3,162.80 = 721.77/x
  3. Step 3: Cross multiply
    2,108.75x = 3,162.80 × 721.77
  4. Step 4: Simplify right side
    2,108.75x = 2,282,798.90
  5. Step 5: Solve for x
    x = 2,282,798.90/2,108.75
  6. Step 6: Final answer
    x = 1,082.54

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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.