Home / 3,321.61-4,981.20-1,129.75

Finding the Fourth Proportional to 3,321.61, 4,981.20 and 1,129.75

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Solution

The fourth proportional to 3,321.61, 4,981.20 and 1,129.75 is: 1,694.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,321.61 : 4,981.20 = 1,129.75 : x
  2. Step 2: Convert to fraction form
    3,321.61/4,981.20 = 1,129.75/x
  3. Step 3: Cross multiply
    3,321.61x = 4,981.20 × 1,129.75
  4. Step 4: Simplify right side
    3,321.61x = 5,627,510.70
  5. Step 5: Solve for x
    x = 5,627,510.70/3,321.61
  6. Step 6: Final answer
    x = 1,694.21

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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.