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Finding the Fourth Proportional to 853.28, 1,279.62 and 478

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Solution

The fourth proportional to 853.28, 1,279.62 and 478 is: 716.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.28 : 1,279.62 = 478 : x
  2. Step 2: Convert to fraction form
    853.28/1,279.62 = 478/x
  3. Step 3: Cross multiply
    853.28x = 1,279.62 × 478
  4. Step 4: Simplify right side
    853.28x = 611,658.36
  5. Step 5: Solve for x
    x = 611,658.36/853.28
  6. Step 6: Final answer
    x = 716.83

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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.