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Finding the Fourth Proportional to 1,121.96, 1,683.09 and 391.44

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Solution

The fourth proportional to 1,121.96, 1,683.09 and 391.44 is: 587.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.96 : 1,683.09 = 391.44 : x
  2. Step 2: Convert to fraction form
    1,121.96/1,683.09 = 391.44/x
  3. Step 3: Cross multiply
    1,121.96x = 1,683.09 × 391.44
  4. Step 4: Simplify right side
    1,121.96x = 658,828.75
  5. Step 5: Solve for x
    x = 658,828.75/1,121.96
  6. Step 6: Final answer
    x = 587.21

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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.