Home / 3,121.92-4,308-1,724.72

Finding the Fourth Proportional to 3,121.92, 4,308 and 1,724.72

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Solution

The fourth proportional to 3,121.92, 4,308 and 1,724.72 is: 2,379.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.92 : 4,308 = 1,724.72 : x
  2. Step 2: Convert to fraction form
    3,121.92/4,308 = 1,724.72/x
  3. Step 3: Cross multiply
    3,121.92x = 4,308 × 1,724.72
  4. Step 4: Simplify right side
    3,121.92x = 7,430,093.76
  5. Step 5: Solve for x
    x = 7,430,093.76/3,121.92
  6. Step 6: Final answer
    x = 2,379.98

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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.