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Finding the Fourth Proportional to 853.88, 1,179.16 and 620.60

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Solution

The fourth proportional to 853.88, 1,179.16 and 620.60 is: 857.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.88 : 1,179.16 = 620.60 : x
  2. Step 2: Convert to fraction form
    853.88/1,179.16 = 620.60/x
  3. Step 3: Cross multiply
    853.88x = 1,179.16 × 620.60
  4. Step 4: Simplify right side
    853.88x = 731,779.25
  5. Step 5: Solve for x
    x = 731,779.25/853.88
  6. Step 6: Final answer
    x = 857.01

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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.