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Finding the Fourth Proportional to 1,780.87, 2,671.31 and 855.85

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Solution

The fourth proportional to 1,780.87, 2,671.31 and 855.85 is: 1,283.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.87 : 2,671.31 = 855.85 : x
  2. Step 2: Convert to fraction form
    1,780.87/2,671.31 = 855.85/x
  3. Step 3: Cross multiply
    1,780.87x = 2,671.31 × 855.85
  4. Step 4: Simplify right side
    1,780.87x = 2,286,236.38
  5. Step 5: Solve for x
    x = 2,286,236.38/1,780.87
  6. Step 6: Final answer
    x = 1,283.78

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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.