Home / 1,122.15-1,680.61-1,083.21

Finding the Fourth Proportional to 1,122.15, 1,680.61 and 1,083.21

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Solution

The fourth proportional to 1,122.15, 1,680.61 and 1,083.21 is: 1,622.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.15 : 1,680.61 = 1,083.21 : x
  2. Step 2: Convert to fraction form
    1,122.15/1,680.61 = 1,083.21/x
  3. Step 3: Cross multiply
    1,122.15x = 1,680.61 × 1,083.21
  4. Step 4: Simplify right side
    1,122.15x = 1,820,453.56
  5. Step 5: Solve for x
    x = 1,820,453.56/1,122.15
  6. Step 6: Final answer
    x = 1,622.29

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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.