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Finding the Fourth Proportional to 853.39, 1,272.99 and 771.31

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Solution

The fourth proportional to 853.39, 1,272.99 and 771.31 is: 1,150.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.39 : 1,272.99 = 771.31 : x
  2. Step 2: Convert to fraction form
    853.39/1,272.99 = 771.31/x
  3. Step 3: Cross multiply
    853.39x = 1,272.99 × 771.31
  4. Step 4: Simplify right side
    853.39x = 981,869.92
  5. Step 5: Solve for x
    x = 981,869.92/853.39
  6. Step 6: Final answer
    x = 1,150.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.