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Finding the Fourth Proportional to 857.44, 1,286 and 446.08

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Solution

The fourth proportional to 857.44, 1,286 and 446.08 is: 669.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.44 : 1,286 = 446.08 : x
  2. Step 2: Convert to fraction form
    857.44/1,286 = 446.08/x
  3. Step 3: Cross multiply
    857.44x = 1,286 × 446.08
  4. Step 4: Simplify right side
    857.44x = 573,658.88
  5. Step 5: Solve for x
    x = 573,658.88/857.44
  6. Step 6: Final answer
    x = 669.04

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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.