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Finding the Fourth Proportional to 921.38, 1,380.85 and 453.09

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Solution

The fourth proportional to 921.38, 1,380.85 and 453.09 is: 679.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.38 : 1,380.85 = 453.09 : x
  2. Step 2: Convert to fraction form
    921.38/1,380.85 = 453.09/x
  3. Step 3: Cross multiply
    921.38x = 1,380.85 × 453.09
  4. Step 4: Simplify right side
    921.38x = 625,653.37
  5. Step 5: Solve for x
    x = 625,653.37/921.38
  6. Step 6: Final answer
    x = 679.04

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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.