Home / 2,142.07-3,213.11-1,317.85

Finding the Fourth Proportional to 2,142.07, 3,213.11 and 1,317.85

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Solution

The fourth proportional to 2,142.07, 3,213.11 and 1,317.85 is: 1,976.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,142.07 : 3,213.11 = 1,317.85 : x
  2. Step 2: Convert to fraction form
    2,142.07/3,213.11 = 1,317.85/x
  3. Step 3: Cross multiply
    2,142.07x = 3,213.11 × 1,317.85
  4. Step 4: Simplify right side
    2,142.07x = 4,234,397.01
  5. Step 5: Solve for x
    x = 4,234,397.01/2,142.07
  6. Step 6: Final answer
    x = 1,976.78

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Similar ratio
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1.5x scale

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.