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Finding the Fourth Proportional to 1,780.80, 2,669.92 and 855.65

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Solution

The fourth proportional to 1,780.80, 2,669.92 and 855.65 is: 1,282.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.80 : 2,669.92 = 855.65 : x
  2. Step 2: Convert to fraction form
    1,780.80/2,669.92 = 855.65/x
  3. Step 3: Cross multiply
    1,780.80x = 2,669.92 × 855.65
  4. Step 4: Simplify right side
    1,780.80x = 2,284,517.05
  5. Step 5: Solve for x
    x = 2,284,517.05/1,780.80
  6. Step 6: Final answer
    x = 1,282.86

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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.