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Finding the Fourth Proportional to 874.02, 1,311.01 and 326.21

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Solution

The fourth proportional to 874.02, 1,311.01 and 326.21 is: 489.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.02 : 1,311.01 = 326.21 : x
  2. Step 2: Convert to fraction form
    874.02/1,311.01 = 326.21/x
  3. Step 3: Cross multiply
    874.02x = 1,311.01 × 326.21
  4. Step 4: Simplify right side
    874.02x = 427,664.57
  5. Step 5: Solve for x
    x = 427,664.57/874.02
  6. Step 6: Final answer
    x = 489.31

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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.