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Finding the Fourth Proportional to 857.43, 1,286.02 and 272.36

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Solution

The fourth proportional to 857.43, 1,286.02 and 272.36 is: 408.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.43 : 1,286.02 = 272.36 : x
  2. Step 2: Convert to fraction form
    857.43/1,286.02 = 272.36/x
  3. Step 3: Cross multiply
    857.43x = 1,286.02 × 272.36
  4. Step 4: Simplify right side
    857.43x = 350,255.14
  5. Step 5: Solve for x
    x = 350,255.14/857.43
  6. Step 6: Final answer
    x = 408.49

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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.