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Finding the Fourth Proportional to 813.92, 1,218.92 and 422.88

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Solution

The fourth proportional to 813.92, 1,218.92 and 422.88 is: 633.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.92 : 1,218.92 = 422.88 : x
  2. Step 2: Convert to fraction form
    813.92/1,218.92 = 422.88/x
  3. Step 3: Cross multiply
    813.92x = 1,218.92 × 422.88
  4. Step 4: Simplify right side
    813.92x = 515,456.89
  5. Step 5: Solve for x
    x = 515,456.89/813.92
  6. Step 6: Final answer
    x = 633.30

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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.