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Finding the Fourth Proportional to 921.87, 1,382.90 and 272.79

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Solution

The fourth proportional to 921.87, 1,382.90 and 272.79 is: 409.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.87 : 1,382.90 = 272.79 : x
  2. Step 2: Convert to fraction form
    921.87/1,382.90 = 272.79/x
  3. Step 3: Cross multiply
    921.87x = 1,382.90 × 272.79
  4. Step 4: Simplify right side
    921.87x = 377,239.93
  5. Step 5: Solve for x
    x = 377,239.93/921.87
  6. Step 6: Final answer
    x = 409.21

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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.