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Finding the Fourth Proportional to 853.39, 1,279.04 and 442.30

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Solution

The fourth proportional to 853.39, 1,279.04 and 442.30 is: 662.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.39 : 1,279.04 = 442.30 : x
  2. Step 2: Convert to fraction form
    853.39/1,279.04 = 442.30/x
  3. Step 3: Cross multiply
    853.39x = 1,279.04 × 442.30
  4. Step 4: Simplify right side
    853.39x = 565,719.39
  5. Step 5: Solve for x
    x = 565,719.39/853.39
  6. Step 6: Final answer
    x = 662.91

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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.