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Finding the Fourth Proportional to 813.58, 1,221.29 and 326.97

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Solution

The fourth proportional to 813.58, 1,221.29 and 326.97 is: 490.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.58 : 1,221.29 = 326.97 : x
  2. Step 2: Convert to fraction form
    813.58/1,221.29 = 326.97/x
  3. Step 3: Cross multiply
    813.58x = 1,221.29 × 326.97
  4. Step 4: Simplify right side
    813.58x = 399,325.19
  5. Step 5: Solve for x
    x = 399,325.19/813.58
  6. Step 6: Final answer
    x = 490.82

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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.