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Finding the Fourth Proportional to 813.72, 1,220.46 and 326.76

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Solution

The fourth proportional to 813.72, 1,220.46 and 326.76 is: 490.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.72 : 1,220.46 = 326.76 : x
  2. Step 2: Convert to fraction form
    813.72/1,220.46 = 326.76/x
  3. Step 3: Cross multiply
    813.72x = 1,220.46 × 326.76
  4. Step 4: Simplify right side
    813.72x = 398,797.51
  5. Step 5: Solve for x
    x = 398,797.51/813.72
  6. Step 6: Final answer
    x = 490.09

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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.