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Finding the Fourth Proportional to 908.60, 1,255.38 and 853.80

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Solution

The fourth proportional to 908.60, 1,255.38 and 853.80 is: 1,179.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.60 : 1,255.38 = 853.80 : x
  2. Step 2: Convert to fraction form
    908.60/1,255.38 = 853.80/x
  3. Step 3: Cross multiply
    908.60x = 1,255.38 × 853.80
  4. Step 4: Simplify right side
    908.60x = 1,071,843.44
  5. Step 5: Solve for x
    x = 1,071,843.44/908.60
  6. Step 6: Final answer
    x = 1,179.66

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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.