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Finding the Fourth Proportional to 873.73, 1,311.20 and 326.35

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Solution

The fourth proportional to 873.73, 1,311.20 and 326.35 is: 489.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.73 : 1,311.20 = 326.35 : x
  2. Step 2: Convert to fraction form
    873.73/1,311.20 = 326.35/x
  3. Step 3: Cross multiply
    873.73x = 1,311.20 × 326.35
  4. Step 4: Simplify right side
    873.73x = 427,910.12
  5. Step 5: Solve for x
    x = 427,910.12/873.73
  6. Step 6: Final answer
    x = 489.75

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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.