Home / 3,121.50-4,683.26-2,185.42

Finding the Fourth Proportional to 3,121.50, 4,683.26 and 2,185.42

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Solution

The fourth proportional to 3,121.50, 4,683.26 and 2,185.42 is: 3,278.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.50 : 4,683.26 = 2,185.42 : x
  2. Step 2: Convert to fraction form
    3,121.50/4,683.26 = 2,185.42/x
  3. Step 3: Cross multiply
    3,121.50x = 4,683.26 × 2,185.42
  4. Step 4: Simplify right side
    3,121.50x = 10,234,890.07
  5. Step 5: Solve for x
    x = 10,234,890.07/3,121.50
  6. Step 6: Final answer
    x = 3,278.84

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Half scale
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Double scale
Find fourth proportional to 3,122.50, 4,684.76 and 2,186.42
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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.