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Finding the Fourth Proportional to 1,780.41, 2,669.86 and 855.75

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Solution

The fourth proportional to 1,780.41, 2,669.86 and 855.75 is: 1,283.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.41 : 2,669.86 = 855.75 : x
  2. Step 2: Convert to fraction form
    1,780.41/2,669.86 = 855.75/x
  3. Step 3: Cross multiply
    1,780.41x = 2,669.86 × 855.75
  4. Step 4: Simplify right side
    1,780.41x = 2,284,732.70
  5. Step 5: Solve for x
    x = 2,284,732.70/1,780.41
  6. Step 6: Final answer
    x = 1,283.26

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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.