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Finding the Fourth Proportional to 853.99, 1,279.96 and 443.32

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Solution

The fourth proportional to 853.99, 1,279.96 and 443.32 is: 664.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.99 : 1,279.96 = 443.32 : x
  2. Step 2: Convert to fraction form
    853.99/1,279.96 = 443.32/x
  3. Step 3: Cross multiply
    853.99x = 1,279.96 × 443.32
  4. Step 4: Simplify right side
    853.99x = 567,431.87
  5. Step 5: Solve for x
    x = 567,431.87/853.99
  6. Step 6: Final answer
    x = 664.45

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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.