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Finding the Fourth Proportional to 921.72, 1,382.62 and 272.52

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Solution

The fourth proportional to 921.72, 1,382.62 and 272.52 is: 408.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.72 : 1,382.62 = 272.52 : x
  2. Step 2: Convert to fraction form
    921.72/1,382.62 = 272.52/x
  3. Step 3: Cross multiply
    921.72x = 1,382.62 × 272.52
  4. Step 4: Simplify right side
    921.72x = 376,791.60
  5. Step 5: Solve for x
    x = 376,791.60/921.72
  6. Step 6: Final answer
    x = 408.79

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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.