Home / 3,121.38-4,307.50-1,724.22

Finding the Fourth Proportional to 3,121.38, 4,307.50 and 1,724.22

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Solution

The fourth proportional to 3,121.38, 4,307.50 and 1,724.22 is: 2,379.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.38 : 4,307.50 = 1,724.22 : x
  2. Step 2: Convert to fraction form
    3,121.38/4,307.50 = 1,724.22/x
  3. Step 3: Cross multiply
    3,121.38x = 4,307.50 × 1,724.22
  4. Step 4: Simplify right side
    3,121.38x = 7,427,077.65
  5. Step 5: Solve for x
    x = 7,427,077.65/3,121.38
  6. Step 6: Final answer
    x = 2,379.42

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Half scale
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Double scale
Find fourth proportional to 3,122.38, 4,308.88 and 1,725.22
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.