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Finding the Fourth Proportional to 893.58, 1,225.80 and 855.78

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Solution

The fourth proportional to 893.58, 1,225.80 and 855.78 is: 1,173.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.58 : 1,225.80 = 855.78 : x
  2. Step 2: Convert to fraction form
    893.58/1,225.80 = 855.78/x
  3. Step 3: Cross multiply
    893.58x = 1,225.80 × 855.78
  4. Step 4: Simplify right side
    893.58x = 1,049,015.12
  5. Step 5: Solve for x
    x = 1,049,015.12/893.58
  6. Step 6: Final answer
    x = 1,173.95

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.