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Finding the Fourth Proportional to 1,447.39, 1,997.49 and 857.80

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Solution

The fourth proportional to 1,447.39, 1,997.49 and 857.80 is: 1,183.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,447.39 : 1,997.49 = 857.80 : x
  2. Step 2: Convert to fraction form
    1,447.39/1,997.49 = 857.80/x
  3. Step 3: Cross multiply
    1,447.39x = 1,997.49 × 857.80
  4. Step 4: Simplify right side
    1,447.39x = 1,713,446.92
  5. Step 5: Solve for x
    x = 1,713,446.92/1,447.39
  6. Step 6: Final answer
    x = 1,183.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.