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Finding the Fourth Proportional to 921.37, 1,382.28 and 272.11

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Solution

The fourth proportional to 921.37, 1,382.28 and 272.11 is: 408.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.37 : 1,382.28 = 272.11 : x
  2. Step 2: Convert to fraction form
    921.37/1,382.28 = 272.11/x
  3. Step 3: Cross multiply
    921.37x = 1,382.28 × 272.11
  4. Step 4: Simplify right side
    921.37x = 376,132.21
  5. Step 5: Solve for x
    x = 376,132.21/921.37
  6. Step 6: Final answer
    x = 408.23

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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.