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Finding the Fourth Proportional to 1,321.75, 1,982.33 and 397.19

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Solution

The fourth proportional to 1,321.75, 1,982.33 and 397.19 is: 595.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.75 : 1,982.33 = 397.19 : x
  2. Step 2: Convert to fraction form
    1,321.75/1,982.33 = 397.19/x
  3. Step 3: Cross multiply
    1,321.75x = 1,982.33 × 397.19
  4. Step 4: Simplify right side
    1,321.75x = 787,361.65
  5. Step 5: Solve for x
    x = 787,361.65/1,321.75
  6. Step 6: Final answer
    x = 595.70

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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.