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Finding the Fourth Proportional to 813.58, 1,218.48 and 401.43

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Solution

The fourth proportional to 813.58, 1,218.48 and 401.43 is: 601.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.58 : 1,218.48 = 401.43 : x
  2. Step 2: Convert to fraction form
    813.58/1,218.48 = 401.43/x
  3. Step 3: Cross multiply
    813.58x = 1,218.48 × 401.43
  4. Step 4: Simplify right side
    813.58x = 489,134.43
  5. Step 5: Solve for x
    x = 489,134.43/813.58
  6. Step 6: Final answer
    x = 601.21

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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.