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Finding the Fourth Proportional to 813.65, 1,220.37 and 326.53

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Solution

The fourth proportional to 813.65, 1,220.37 and 326.53 is: 489.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.65 : 1,220.37 = 326.53 : x
  2. Step 2: Convert to fraction form
    813.65/1,220.37 = 326.53/x
  3. Step 3: Cross multiply
    813.65x = 1,220.37 × 326.53
  4. Step 4: Simplify right side
    813.65x = 398,487.72
  5. Step 5: Solve for x
    x = 398,487.72/813.65
  6. Step 6: Final answer
    x = 489.76

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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.