Home / 2,185.18-3,278.70-1,211.20

Finding the Fourth Proportional to 2,185.18, 3,278.70 and 1,211.20

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Solution

The fourth proportional to 2,185.18, 3,278.70 and 1,211.20 is: 1,817.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,185.18 : 3,278.70 = 1,211.20 : x
  2. Step 2: Convert to fraction form
    2,185.18/3,278.70 = 1,211.20/x
  3. Step 3: Cross multiply
    2,185.18x = 3,278.70 × 1,211.20
  4. Step 4: Simplify right side
    2,185.18x = 3,971,161.44
  5. Step 5: Solve for x
    x = 3,971,161.44/2,185.18
  6. Step 6: Final answer
    x = 1,817.32

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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.