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Finding the Fourth Proportional to 873.81, 1,311.21 and 326.36

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Solution

The fourth proportional to 873.81, 1,311.21 and 326.36 is: 489.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.81 : 1,311.21 = 326.36 : x
  2. Step 2: Convert to fraction form
    873.81/1,311.21 = 326.36/x
  3. Step 3: Cross multiply
    873.81x = 1,311.21 × 326.36
  4. Step 4: Simplify right side
    873.81x = 427,929.77
  5. Step 5: Solve for x
    x = 427,929.77/873.81
  6. Step 6: Final answer
    x = 489.73

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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.