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Finding the Fourth Proportional to 1,107.42, 1,660.68 and 327.21

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Solution

The fourth proportional to 1,107.42, 1,660.68 and 327.21 is: 490.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.42 : 1,660.68 = 327.21 : x
  2. Step 2: Convert to fraction form
    1,107.42/1,660.68 = 327.21/x
  3. Step 3: Cross multiply
    1,107.42x = 1,660.68 × 327.21
  4. Step 4: Simplify right side
    1,107.42x = 543,391.10
  5. Step 5: Solve for x
    x = 543,391.10/1,107.42
  6. Step 6: Final answer
    x = 490.68

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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.