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Finding the Fourth Proportional to 2,185.74, 3,278.88 and 725.85

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Solution

The fourth proportional to 2,185.74, 3,278.88 and 725.85 is: 1,088.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,185.74 : 3,278.88 = 725.85 : x
  2. Step 2: Convert to fraction form
    2,185.74/3,278.88 = 725.85/x
  3. Step 3: Cross multiply
    2,185.74x = 3,278.88 × 725.85
  4. Step 4: Simplify right side
    2,185.74x = 2,379,975.05
  5. Step 5: Solve for x
    x = 2,379,975.05/2,185.74
  6. Step 6: Final answer
    x = 1,088.86

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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.