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Finding the Fourth Proportional to 1,321.21, 1,982.58 and 541.33

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Solution

The fourth proportional to 1,321.21, 1,982.58 and 541.33 is: 812.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.21 : 1,982.58 = 541.33 : x
  2. Step 2: Convert to fraction form
    1,321.21/1,982.58 = 541.33/x
  3. Step 3: Cross multiply
    1,321.21x = 1,982.58 × 541.33
  4. Step 4: Simplify right side
    1,321.21x = 1,073,234.20
  5. Step 5: Solve for x
    x = 1,073,234.20/1,321.21
  6. Step 6: Final answer
    x = 812.31

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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.