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Finding the Fourth Proportional to 813.11, 1,218.77 and 401.38

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Solution

The fourth proportional to 813.11, 1,218.77 and 401.38 is: 601.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.11 : 1,218.77 = 401.38 : x
  2. Step 2: Convert to fraction form
    813.11/1,218.77 = 401.38/x
  3. Step 3: Cross multiply
    813.11x = 1,218.77 × 401.38
  4. Step 4: Simplify right side
    813.11x = 489,181.80
  5. Step 5: Solve for x
    x = 489,181.80/813.11
  6. Step 6: Final answer
    x = 601.62

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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.