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Finding the Fourth Proportional to 921.66, 1,382.63 and 272.31

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Solution

The fourth proportional to 921.66, 1,382.63 and 272.31 is: 408.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.66 : 1,382.63 = 272.31 : x
  2. Step 2: Convert to fraction form
    921.66/1,382.63 = 272.31/x
  3. Step 3: Cross multiply
    921.66x = 1,382.63 × 272.31
  4. Step 4: Simplify right side
    921.66x = 376,503.98
  5. Step 5: Solve for x
    x = 376,503.98/921.66
  6. Step 6: Final answer
    x = 408.51

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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.