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Finding the Fourth Proportional to 853.23, 1,279.44 and 487.92

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Solution

The fourth proportional to 853.23, 1,279.44 and 487.92 is: 731.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.23 : 1,279.44 = 487.92 : x
  2. Step 2: Convert to fraction form
    853.23/1,279.44 = 487.92/x
  3. Step 3: Cross multiply
    853.23x = 1,279.44 × 487.92
  4. Step 4: Simplify right side
    853.23x = 624,264.36
  5. Step 5: Solve for x
    x = 624,264.36/853.23
  6. Step 6: Final answer
    x = 731.65

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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.