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Finding the Fourth Proportional to 859, 1,287.78 and 447.88

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Solution

The fourth proportional to 859, 1,287.78 and 447.88 is: 671.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    859 : 1,287.78 = 447.88 : x
  2. Step 2: Convert to fraction form
    859/1,287.78 = 447.88/x
  3. Step 3: Cross multiply
    859x = 1,287.78 × 447.88
  4. Step 4: Simplify right side
    859x = 576,770.91
  5. Step 5: Solve for x
    x = 576,770.91/859
  6. Step 6: Final answer
    x = 671.44

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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.