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Finding the Fourth Proportional to 873.89, 1,311.17 and 326.52

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Solution

The fourth proportional to 873.89, 1,311.17 and 326.52 is: 489.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.89 : 1,311.17 = 326.52 : x
  2. Step 2: Convert to fraction form
    873.89/1,311.17 = 326.52/x
  3. Step 3: Cross multiply
    873.89x = 1,311.17 × 326.52
  4. Step 4: Simplify right side
    873.89x = 428,121.60
  5. Step 5: Solve for x
    x = 428,121.60/873.89
  6. Step 6: Final answer
    x = 489.91

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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.