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Finding the Fourth Proportional to 857.62, 1,286.44 and 309.82

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Solution

The fourth proportional to 857.62, 1,286.44 and 309.82 is: 464.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.62 : 1,286.44 = 309.82 : x
  2. Step 2: Convert to fraction form
    857.62/1,286.44 = 309.82/x
  3. Step 3: Cross multiply
    857.62x = 1,286.44 × 309.82
  4. Step 4: Simplify right side
    857.62x = 398,564.84
  5. Step 5: Solve for x
    x = 398,564.84/857.62
  6. Step 6: Final answer
    x = 464.73

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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.