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Finding the Fourth Proportional to 2,154.06, 3,231.72 and 855.72

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Solution

The fourth proportional to 2,154.06, 3,231.72 and 855.72 is: 1,283.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,154.06 : 3,231.72 = 855.72 : x
  2. Step 2: Convert to fraction form
    2,154.06/3,231.72 = 855.72/x
  3. Step 3: Cross multiply
    2,154.06x = 3,231.72 × 855.72
  4. Step 4: Simplify right side
    2,154.06x = 2,765,447.44
  5. Step 5: Solve for x
    x = 2,765,447.44/2,154.06
  6. Step 6: Final answer
    x = 1,283.83

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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.