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Finding the Fourth Proportional to 853.39, 1,279.80 and 333.26

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Solution

The fourth proportional to 853.39, 1,279.80 and 333.26 is: 499.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.39 : 1,279.80 = 333.26 : x
  2. Step 2: Convert to fraction form
    853.39/1,279.80 = 333.26/x
  3. Step 3: Cross multiply
    853.39x = 1,279.80 × 333.26
  4. Step 4: Simplify right side
    853.39x = 426,499.75
  5. Step 5: Solve for x
    x = 426,499.75/853.39
  6. Step 6: Final answer
    x = 499.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.