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Finding the Fourth Proportional to 813.92, 1,218.90 and 381.20

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Solution

The fourth proportional to 813.92, 1,218.90 and 381.20 is: 570.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.92 : 1,218.90 = 381.20 : x
  2. Step 2: Convert to fraction form
    813.92/1,218.90 = 381.20/x
  3. Step 3: Cross multiply
    813.92x = 1,218.90 × 381.20
  4. Step 4: Simplify right side
    813.92x = 464,644.68
  5. Step 5: Solve for x
    x = 464,644.68/813.92
  6. Step 6: Final answer
    x = 570.87

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.