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Finding the Fourth Proportional to 1,185.98, 1,636.56 and 855

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Solution

The fourth proportional to 1,185.98, 1,636.56 and 855 is: 1,179.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.98 : 1,636.56 = 855 : x
  2. Step 2: Convert to fraction form
    1,185.98/1,636.56 = 855/x
  3. Step 3: Cross multiply
    1,185.98x = 1,636.56 × 855
  4. Step 4: Simplify right side
    1,185.98x = 1,399,258.80
  5. Step 5: Solve for x
    x = 1,399,258.80/1,185.98
  6. Step 6: Final answer
    x = 1,179.84

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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.