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Finding the Fourth Proportional to 1,481.05, 2,043.87 and 817.90

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Solution

The fourth proportional to 1,481.05, 2,043.87 and 817.90 is: 1,128.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,481.05 : 2,043.87 = 817.90 : x
  2. Step 2: Convert to fraction form
    1,481.05/2,043.87 = 817.90/x
  3. Step 3: Cross multiply
    1,481.05x = 2,043.87 × 817.90
  4. Step 4: Simplify right side
    1,481.05x = 1,671,681.27
  5. Step 5: Solve for x
    x = 1,671,681.27/1,481.05
  6. Step 6: Final answer
    x = 1,128.71

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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.