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Finding the Fourth Proportional to 2,105.68, 3,157.44 and 806.80

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Solution

The fourth proportional to 2,105.68, 3,157.44 and 806.80 is: 1,209.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,105.68 : 3,157.44 = 806.80 : x
  2. Step 2: Convert to fraction form
    2,105.68/3,157.44 = 806.80/x
  3. Step 3: Cross multiply
    2,105.68x = 3,157.44 × 806.80
  4. Step 4: Simplify right side
    2,105.68x = 2,547,422.59
  5. Step 5: Solve for x
    x = 2,547,422.59/2,105.68
  6. Step 6: Final answer
    x = 1,209.79

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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.